In reply to The best font foundries NOT on MyFonts:
As I said before - most of the foundries in the top 50 will be on much better royalty rates than 50%. Most will be on 65% but some are as high as 80% I believe. I think 50% is a fair amount for new foundries - the exposure is greater than it was when these foundries joined up at better rates.
Nothing's set in stone though. Show your fonts to MyFonts and make them an offer royalty-wise. Worse they can do is say no.