I have dumped more companies both affiliate and otherwise for not answering a simple email. I do know that
ISprime has
always answered my emails promptly when I needed something done. As far as affiliate programs go
SexyAds has been really good to me when I needed things done or banners made and the guys at
SpunkyDollars are pretty cool too.
Never ceases to amaze me though how many companies both adult and mainstream NEVER answer email. If they aren't going to answer it, they shouldn't have a link for it on their sites.