For me it would make more sense to have something like “unlock for a week” if the dev wants to keep the ongoing revenue model. Of course a lifetime purchase is even better, not sure why that’s not an option.

I would be happy to pay $100 for unlimited access and be locked into the current version of the app, maybe only have minor version updates free so you don’t get locked into a buggy version.

But that’s a more complicated licensing model to implement I guess.