I agree with you and no wonder some folks panic or sell when their investment is not yet mature and I think the major reason why some of these folks buy more than what is in their discretionary is because of greed, wanting to have a big portfolio when they don't have what it takes to do that. I have really learnt something from this your post, at least I now know that investing beyond what is in one's discretionary is over aggressiveness which is a wrong move for an investor most especially those with little source of income.
It doesn't mean that it's especially for those with little source of income. If you have a big source of income and you invest beyond your discretionary income, it's going to affect your bitcoin investment down the road because you need to put your basic needs and monthly expenses as your first priority. This is why it's good to cut down expenses even though you are rich so that you can have a higher discretionary income than when you are spending on unnecessary things.
Buying over aggressively is not a good investment practice for both the rich and the poor, because when you have too many bitcoin with less fiat, you will have to sell some bitcoin to take care of important needs, which shouldn't be the plan.