I had the same thing happen to me this period. 0$ sale. It wasn't a webmaster referal. My stats say the signup came from a hosted gallery. More specifically this one.
http://bzn.brazzers.com/m/btis/169f/...x,0,0,0,132599
As for ratios...well....1:3039 for this month. It's a far cry from the 1:400ish from a year ago. Sure do miss those big checks.