A visitor needs to click on the 'Click Here' offer link within the Intellichat campaign & then purchase for us to be credited on the join. To be honest, if you are not happy with having either a trial offer or discounted price point on your affiliate ID just ask the program owner to disable the Intellichat campaign on your traffic...
As i said before, the option is there to split a payout on a saved sale... This was put in place to help increase the site joins aswell as keeping you guys (affiliates) in the loop on the join. Maybe the trial option isnt right for the site you are referring to, incentives can be changed...