Connect the two dots(two extreme conditions) and draw a curve, high chances are that at last, your profits from all investments may not be that much, at least much less than what you expected when you first gained that $10K. Therefore, all the occasional profits between investments may become fixed or variable costs that these investment must pay.
Let's say to simplify the question you are asking, authorized capital is $10k and net profit is $10k, then on the way you need cash and sell bitcoins. If that's me, $ 10k is used for needs and $ 10k is used to buy, but if this pattern is continuously carried out the profit on your investment will not increase.
Instead investments can be combined with savings, for example if you apply a certain investment percentage and a certain percentage saving, then when you need cash you don't have to sell bitcoins but you can use temporary savings. The choice is not the amount of investment, but you understand the conditions whenever you need cash and if you invest then you sell it back without remaining, it's the same as placing money in the bank on a deposit.