I have an app and I'm trying to figure out the pricing. I’m offering a one-time in app purchase of life-time subscription. Currently it costs 6x the monthly su

I have an app and I'm trying to figure out the pricing. I’m offering a one-time in app purchase of life-time subscription. Currently it costs 6x the monthly subscription cost. I'm worried that makes it too expensive for a simple app, at the same time lowering it would make the monthly subscription less sensible. I'm curious if anyone has indie experience and thoughts regarding this.