IMHO 1:2000 raw is about par for affiliates promoting pay sites today. Be careful not to let some sponsors who aren't counting first page hits like RK, BangBros, Program3 (now Manwin) skew your stats or expectations.
A while ago based on trends I predicted we'd be at pushing 1:3000 by the end of 2012. I wouldn't be surprised if it happens.
https://gfy.com/showthread.php?t=992899