You don't understand how investments work. Your gain is always proportional to your investment. If you put in $100 and the price goes up by 10%, you'll earn $10. If you put in $1000, you'll earn $100 and so on. Whether you're buying a whole coin or a fraction of it doesn't matter. Do you really believe there's a real difference between someone buying a 0.99 BTC and someone else buying 1? Their profits will be almost exactly the same, even though one of them doesn't have the whole thing!