Yeah. I've been approached by some non-Plimus affiliates and I've refused them. Chances are an average affiliate will mean only a few sales to you. And I don't want to have RegNow, eSellerate and BMT accounts wth $50 each.
Maintaining them all is just a PITA and I think some ecommerce providers don't even send you the money until you reach some minimum revenue (like $100). Even better, creating a vendor RegNow account is not free. Definitely not worth.