So, you are just connecting numbers from here and there and making that assumption that 2.625 is a good optimal investment size for BTC! is that what you are saying. If that's the case what will you do with the money which you still have in savings along with the 2.625 BTC. Will you not spend those fiat money to buy more BTC. Because the more BTC you will have the more profit or loss you could make.
Large investment = large Returns.
This rule applies to investments but doesn't work for money. If the US government printed money and no one in the world bought it, the value of the dollar would be 0. If Satoshi kept all 21 million bitcoins for himself, the value of bitcoin would be 0.