It solely the decision of any investor to decide how much he is willing to invest in Bitcoin or any other asset. Bitcoin have high return proportional to the investors Level of Accumulation of it (stash) which is guaranteed in a long run, it simply a matter of discipline, if the investor is disciplined there is nothing that can shift his focus.
Bitcoin's price performance is not guaranteed in the long run to go up - even though many folks (including myself) invest into bitcoin based on presumptions that it is more likely than not to go up in the long run... so each of us needs to establish our position size in accordance with a variety of factors, including the factor that BTC's price is not guaranteed to go up.
Sometimes I do come across people talking vehemently about their investments being guaranteed in the long run forgetting to know that uncertainty do happen even though we are making speculations but the most reasons why we make good speculations about the asset we invested on is simply because we need to be positive and hope for the best in our investments but that shouldn't mean we should be too affirmative in our analysis and speculations because so far as bitcoin is concerned, there are factors that leads to projection of it's price, so if those factors don't appear in the actual direction then it will be difficult to maintain same irrational mindset or beliefs.
Basically being realistic and positive about investing in Bitcoin will motivate you to accumulate a much larger stack.You may be accumulating a part of the worldly wealth in Bitcoin and it has to pull up to a point and keep your tongue wet. I have seen some investors convert some of their assets into Bitcoin and they choose to build another asset there. And there is a reflection of their confidence. You can follow them if you have confidence and positive attitude. I think a positive attitude is absolutely essential in investing and without it you will not be able to accumulate your stack freely. You should decide to choose your cushion amount of assets in depositing Bitcoin because you are holding it and the rest of the assets are financial security.
Selling your assets to buy Bitcoin is not advisable except they are liability that are in form of assets and they are not productive or bringing any returns or proceeds for you at the end of the day but if they are business assets like lease office equipments such as heavy duties, caterpillars, construction equipments and lifting equipments these are very good assets because they give you good proceeds so you can't sell such assets to buy Bitcoin but you can use the proceeds to invest in bitcoin, the only time you can consider selling such assets to buy Bitcoin is in a case where they start malfunctioning or getting old such that the cost of maintenance may be higher than the income they generate for you.
Selling your assets to buy Bitcoin is not bad if the cost of maintenance of those assets becomes too much but never use because you are inquisitive to buy Bitcoin and sell a valuable asset even though Bitcoin is also a valuable asset because just like what I was emphasizing before you quoted me than even though we are hopeful that our investments in Bitcoin are secured but let us not also forget that there are unforseen events that are likely to occur if the forces that keeps the market going are not in place so we should be mindful and thoughtful of the decisions we take when making investments.
Probably, overall, your post is correct Cryptoprincess101 - even though you started out with the suggestion of not selling your assets to buy bitcoin, but then your exception swallows the rule..
In other words, you are not saying don't sell your assets to buy bitcoin, but instead you are suggesting to make some calculations regarding assets that you might or might not sell in order to buy bitcoin - which truly is the main overall preference to figure out the extent to which there might be more value in holding value in bitcoin versus holding that value in other assets. Some assets gain in value, others lose value and others may generate income.. and some assets have all of those characteristics at the same time or maybe depending on other circumstances that might not always be known at the time that decisions are made. Of course, you mentioned expenses that might be associated with some, assets and furthermore, some assets may well generate income only upon the application of a lot of labor, so in the end, there may end up being some questions regarding how much labor (or other inputs) are required for the assets to actually end up generating income.
There may well be liquidity considerations too. Some assets are more liquid than others, and sometimes liquidity could unexpectedly become more available or unexpectedly dry up, and even though we might have some guesses and/or estimations, we do not always know in advance regarding liquidity.
Also, sometimes if bitcoin is a better asset, there still could be some value to hold some value in other assets, which could be considered as diversification, but holding value in other assets can sometimes be helpful to not necessarily draw attention to situations in which you might want to have options and not necessarily have all your value tied up in bitcoin (even if you have bitcoin and cash there can be value in terms of having other assets and/or currencies).