I don't think is nice encouraging someone to invest on Bitcoin using his 30% of salary to invest on Bitcoin because there is every possibility that the investor could ran into trouble if the reserve fund is not enough to sustain him till he receives his next salary, so perhaps in as much as is advisable to take advantage of the Bitcoin price right now but shouldn't get overwhelmed by investing aggressively because is better to invest with the money we can easily afford without being tampered than investing with all the money we have and within a short while you end up selling it do to the lact of money to take care of other needs, however is only those that have structured one of there portfolio for Lump suming I could easily advise to take advantage of the market because they have already taken all the measures before now.
There is no fixed percentage that is universal as regarding what to invest in Bitcoin. It is always to each his own; you are expected to work out what you will be comfortable to leave in Bitcoin, an amount that will not stop you from living your normal life. There are some people people whose 10% of their income is enough for their needs and they will still have surplus from it. Those are the people at the upper echelon of society that are making decent amount of money that are way above what they can possibly spend. This set of people can even afford to invest 50% of their income into Bitcoin.
If I fall into this category of people, I will definitely put at least 50% of my income into Bitcoin because I don't know of any better asset class to invest in and save for retirement.
It will depend on what you can afford to put on your bitcoin investment and any amount is fine as long as you have BTC bought which can increase your holdings. They should not get ashamed if they can afford small percentage since this is how greatness starts since as long as we are consistent on the investment choices we do for sure it will grow continuously in future.
People need to remember that its not all about the sizes of their investment since it all matter on their will to invest on crypto plus how eager they up getting a lot of knowledge to use for their investment. Those strategies mentioned will surely help them to increase their investment sizes so now its all matter on how people gonna take effort since they are the one who can make their selves profitable. Also right now I'm into 35% - 50% of my funds goes to bitcoin investment and so far doing great and yet still bullish and yet plan to add more in my portfolio to save up for long term purposes since we know that bitcoin always got good potential that's why I make sure that I'm not left behind on its future growth.