IT's not how it comes out CS, and it is very demeaning to other rescues - we might not all be able to ask for large amounts of money (and incidentally, I didn't think non-registered rescues could specify an amount - I can't see her charity no on her website), but we have homed a couple of Persians, we dont charge more, and the two I know of both went to good homes (both people known by the rescue), and with people who have experience and wouldnt dream of passing them about indiscriminately.
I see your point, but still dont think a reserve and pay system works - if someone pays and then doesn't turn up, you are still in the same situation. We rarely work on a reserve system.