I've been having this doubt for a long time, though I really don't worry as I'm mainly into promoting amazon and adsense stuff.
But recently, I wanted to do some clickbank promotions too and decided to put up a blog. But I have the same doubt now.
Should I put my blog and send visitors to the affiliate site directly? or should I send them to a pre-sell page and then send them to affiliate site via the pre-sell page.
I want to know which works better from your previous experiences. I'm gonna try both too, but your opinions will definitely help me and many others