Really nice bag!
I know the effort and material that goes into one of these, so I'm wondering if you might not want to find some less expensive fabric (still good quality, but not quite as pricey) so that you could keep your price point at $20 and not feel like you're just giving them away.
We quilters know the value of such an item, but the general public has very little idea of the actual cost of materials plus the time and experience to do something like this, so they are going to mentally go with thinking it cost you maybe $5 and an hour or so to make.
Now if you are in a more affluent area you could likely get considerably more, but not here where I am.