The later the game is the more effective they can be because of the number of bases... plus you should be able to afford on 3+ bases but yeah they are kind all in during the mid game.
The thing with banes is that although they're almost guaranteed worker kills which is sick, after they've put down 2+ spors, turrets ect... its seems nullified
Plus if you dropped roaches or anything else besides banes they’d force the army or at least portion of it to come back to defend which can be pretty handy.
Also with roaches if you’ve got burrow movement you could be so annoying if they didn’t have sufficient detection.
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