Earning Points for product trials

I new to the site and have been thinking about testing some of the product trials to get bonus points, I noticed they all have the "If you cancel the membership your bonus points may be removed" or something like that. So does anyone have any experience with this? If so, what does that mean exactly because its very vague and I dont know if they mean during the trial period or 5 years from now.

I haven't done product trials before. Best answer is to send a private message to those who have. They're usually on the "view most recent activity" list. Or, try Zab.

I ususaly wait until the trial is almost over and then I cancel. Haven't had any problems.