It's well known that buying a bonus doesn't guarantee that you will hit something big.
That’s correct. The RTP on bonus buys remains the same as on regular spins, so it clearly doesn’t increase your chances of winning or guarantee a big win. However, it’s still more fun and exciting than regular spins because it has a more attractive animations and effects and also because the amount at stake is usually higher.
The RTP can be different on some games, as long as I know some pragmatic games have higher RTP on its bonus buy compared to regular spins.
Although higher RTP on bonus buy does exist but it does not mean that our luck will be also be bigger when we use bonus buy more than regular spins.
Its all about preferences whether to play with regular spins or bonus buy, I do both when I play slot games because playing with regular spins all the time can be boring and takes too long time.
Bonus buy give an instant way to enter bonus game without waiting for hundreds spins to get it, so it is basically a good option for players who do not have too much time in gambling.