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Bonus buy just give you a chance to get special bonus rounds and free spin but it doesn't really mean that you can automatically hit something big from them. I guess there are some people got confuse about it that's why they look forward to do this even if they have small bank rolls.
I do this when I have enough balance to spend. But if I deposit only small amount just to enjoy the game I usually skip taking those bonus buy feature since I want to extend my bet by placing small amount without getting to much pressure.
It is true that getting free spins does not guarantee a big win, but that is where the hope lies, because the possibility of getting a big win is usually hidden in the feature. That is why many people are tempted to buy the bonus buy, especially those who can't wait for the regular spins to give the feature naturally. Although the risk is high, for some players, buying free spins is considered a shortcut to chasing luck.
Since my time playing slots games, i haven't won very big amount from free spins, my normal spin or automatic spin has given me more wins than when i get free spins, either from Bonus buy. I remembered getting 15 free spins on a $0.2 bet, all i got after the 15 spins were concluded was $6.27, truly i expected more since it was a free spin and should come with higher chances of winning, realizing that it was just some normal spin and has no extra feature to win big. Free spins give multiple wins on one bet amount, which is the advantage.