Wow! Profinity.com was still there a couple of weeks ago. I joined them last Christmas with the sole intent of earning SkyMiles.
I usually have the philosophy of cashing out as soon as you reach the minimum level in any of these schemes, just to be on the safe side, but in this case even that didn't help me. As soon as I reached the level to get 500 SkyMiles I cashed-in only to get an e-mail back after a couple of weeks saying that Delta had pulled out of the scheme and that my points would be reimbursed along with a bonus. Not happy with this I e-mailed back complaining, and got a reply strongly criticizing both Delta and American for pulling out of the Profinity scheme.
I've contacted Delta a number of times over this and even included the e-mail I recieved from Profinity and Delta won't even acknowkledge my e-mails. That itself tends to suggest to me that Profinity were, as they claim, a victim of Delta's backtracking.
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Mark