To Become a Successful Clickbank Earner you Must
1) Make sure your product converts before getting it published in the marketplace
2) Provide a fantastic set of promotional tools for your affiliates
3) Advertise your affiliate program using PPC and in forums like Afriwap
4) Hire an affiliate manager to spread the word
make sure you set a reasonable price for your product ($27-47)
-plus you HAVE to give affiliates 75% commission. On clickbank, almost nobody bothers with anything less than 75, unless your name is already well known (such as a few vendors in the MMO niche)
-give all your support to affiliates who show interest, and stay in close contact with them.
Once you know your product converts make sure you add as much material into the affiliates section as possible.
The easier you make it for affiliates the more chance of success you will have.