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There are some fantastic iPad apps. Procreate and GoodNotes are two of my favorites. They are also insanely inexpensive. I can't imagine making something as good as Procreate and then only charging $10 for it. If I had an idea for something complex on the iPad I would have serious reservations about developing it. You can't charge reasonable prices for software unless you do it in $0.99 chunks.
Procreate is the killer app of the Apple pencil and maybe even the iPad Pro. The pricing is indeed strange. There are people paying $999 for a tablet, $129 for the pencil, just to run a $10 app.
I don't have a solution for this problem. There has to be something in between a one-time $10 purchase and a $120 annual subscription, but Apple hasn't shown any interest in finding it.