So you started writing crappy apps because it was easier for you and now you want to be paid double to fix your shit?
Quality is generally more expensive, particularly the finely tuned kind.
Depends on how bad it is and how important snappiness is. Apps that aren't snappy cause all kinds of cognitive problems with attention.
They will ask for Open Source alternatives, we have seen this for more than a decade. I only saw a few comments that say "you should get rid of free tier" per year.
$5 -> this looks cheap, probably poor quality
$49 -> this is quite too much
$99 -> are you kidding me