OK? That's just the reality of business. You launch something and then need to do marketing to keep getting it in front of people until word spreads around that your app is a must-have thing for whatever it does and you get a decent number of sales every month.

In general, when I buy something I want to pay for it once and then have it. I don't want to rent or lease it, even if it's consumable. When I eat a restaurant I I pay for the meal when it's over; if it was delicious I might come back again. Even if I like it so much that I eat there every week, that doesn't mean I want a weekly subscription.

You're using a device with an ever-evolving OS that constantly breaks compatibility.

If you paid for it once and only got to keep the version of it as of when you paid for it, in a couple years the platform would remove your ability to use it.