Absolutely. If you force the user to choose to pay on an item-by-item basis, they're definitely going to use it less.
For me, it's a bit like mobile phone data charges. When I used to pay per mb, I hesitated to use cellular data at all, but now I have a (high) monthly allowance, I now use my phone a lot more, even though the cost is higher.
Perhaps the developer should try switching to a pay-monthly kind of subscription, at least then the users aren't having to make that 'is it worth it?' decision each time they want to use the app.
For me, it's a bit like mobile phone data charges. When I used to pay per mb, I hesitated to use cellular data at all, but now I have a (high) monthly allowance, I now use my phone a lot more, even though the cost is higher.
Perhaps the developer should try switching to a pay-monthly kind of subscription, at least then the users aren't having to make that 'is it worth it?' decision each time they want to use the app.