There is not currently a WoS Collectors Club, though Playmates is currently considering something along those lines. In a response Q&A, Playmates said that:
"The idea of supporting a Simpsons collector club is still being discussed. Due to recent slowdown in sales at retail further discussions about the club have been put on hold until after we have our Fall previews with all retailers. As far as product goes, we would probably look at a combination of talking and non talking figures. The one that makes the most sense to offer to the club is a non-talking Rabbi Krustofski. We could look at doing a exclusive playset after getting order results from a figure. The minimum order quantities and price for a playset are going to be higher due to the higher development and tooling costs. "