Mate, of course it will be reduced. Let’s say you have one whole of cake, that whole cake you bought was for a dollar. Over time, it grew value. So now it is priced at $10. You have made $9 as a profit. If you take one piece, of course it will be reduced. Same as bitcoin. If you now sell this cake, you can get the $10 but you can’t just get your cake and your money both at the same time. Bitcoin is an asset that you can buy or sell.