How do you know if buying a bonus is worth it?

Lately, I’ve been looking at slots with bonus buy features, but I’m trying to figure out if they’re actually worth it or just a fancy way to drain your balance faster. Some games charge 100x your bet, others go up to 250x or more, and it makes me wonder—how do you actually determine if buying the bonus is a good move? Is there a way to calculate whether the RTP on a bought bonus is better than just playing normally?

I’ve seen some people say that certain slots are only worth playing if you buy in, but that seems risky unless you know the math behind it. Anyone have a good strategy for deciding when (or if) it’s worth it?
 
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