Tommy... you never fail to impress!
Fantastic idea - and I agree with everyone here - WELL worth the $50! In fact, I think it's obvious that you could have charged more and it wouldn't have been an issue. Anyone that complains either A - doesn't know the value of TB traffic (and therefore is NOT worthy - lol) or B - isn't making more than beer money anyway.
I'm all for helping out newbies, but giving natural selection a little nudge every now and then is a good idea IMHO.
Congrats on this being such a success!
