Bonus buy can be from from 50 or 60 dollars or more.
Really? From $50 or $60 and even more?
I can't say that buying bonuses is good or bad... we usually find that out after we buy the bonus! What I can say is that the odds are not in our favor, maybe 1 in 10 buys will be successful, if we are lucky a few of them. But I had 5-10 bonus buys in a row after which I could only stop playing because I didn't have enough money for another buy, all bonus buys wins were negative, some of them a total disaster with x1-x5 payouts.
It's good when we can buy "super bonus rounds", but they are usually x1000 base bet, so they are not cheap. We shake until we just recover the money, which does not happen every time, even those super bonuses can disappoint big time... been there and done that.
In the end, bonus buys are good for fast play full of excitement. Bonus spins can be with some crazy features and all that music and sounds can really be interesting... but don't get carried away, it's still gambling, just with higher stakes.