Would you pay for a saas starter kit?

Hello mates,
Looks like this isn’t a new-ish idea, but my investigation didn’t provide any clear picture whatsoever.
So the idea is to create a backend starter which includes basic features for a saas product - auth, payments, subscription management, newsletter etc. Not sure what would be flow to deliver the product to end users, but maybe some of you guys had any experience with such products? Or maybe you already have this problem and have some thoughts? or maybe there are some obvious pitfalls which are not clear for me at this stage. Anyway, as a founder of multiple pet projects I would definitely benefit from a ready made starter which is easy to extend. How about you?