Encouraging new investors to commit small amount of money to bitcoin at the beginning is not even necessary even though you might be making some sense on the basis that their emotions will not be engaged in the investment after all since the money is small. I think there are more important things to advise newbies such as developing the mindset of long-term investment without expecting to become rich the next day, which is the root cause of impatience and by extension, the problems most new investors encounter in bitcoin. If the mindset is right from the beginning, they will do better on the long run.
You are actually right bro, if the mindset is right from the beginning, they will surely do well on the longer run, but take note that money I invest in Bitcoin today may be small to me, but it can also be very huge to another, so the right thing you should be saying is that every Bitcoin Investor should invest what he can afford to lose base on his level, the problem most of this investors usually have is that they didn't come into Bitcoin investment with a long term perspective, they want to just make quick money, not knowing that the way Bitcoin is wired, it's more profitable and lucrative to hold for a longer duration than a shorter timeframe, but any newbie investors that has the right mindset from the beginning and is equally investing an amount he can afford to lose, their is a higher probability that that person will be successful in his investment.
I cannot tell a newbie investor how much to start their DCA journey with, they have to make a budget of their income and determine how much they can conveniently use to invest in Bitcoin.
I don't have the mindset of "invest what you can afford to loose" when it comes to Bitcoin investment, I believe that the phrase is best suited for gambling and shitcoins. It is investments that you're not sure of their ROI in the future that you can invest insignificant amounts so if the project dies you will only loose your insignificant amount.
In Bitcoin investment you can invest with lump sums or DCA method depending on your financial strength and budget allocation. Instead of investing what I can afford to loose in Bitcoin investment because I know that it's a store of value I'll rather invest with amount that I can conveniently afford for a valued asset not what I can loose. Amount that I can use to buy Bitcoin is gotten after I priotize my financial needs, not an insignificant amounts.