I agree with Jasun. In fact, we *tried* removing all the nonrecurring joins from our join pages, and conversions dropped significantly. The crazy thing is, many surfers will choose an identical period (1 month) join at up to $15 more than a recurring join. If you don't offer the nonrecurring join, some of those members simply won't sign up, or at least that's what our tests have indicated on our sites.

For us it isn't about ripping off the affiliate, it's about trying to get the surfer to buy the product in the first place.