This is speaking in generalizations, but it's the concept that as long as SSC holds back on a Fett or Yoda or other highly desired figure, we as collectors will always be coming back. Collectors want to collect. If SSC keeps putting out sub-par level characters, we will continue to buy them, with the hopes that one day they will make the grail-type characters that we want. "Oh, Hammerhead. That'll look nice next to my Fett that I'm sure SSC will make next year. Better grab that Hammerhead now, since there isn't anything else going on." Or, "Holy crap, it's Hammerhead! I've always wanted one. Sold."
Again, there's also production quality. Would you want a Boba that has the same quality as Bespin Han or ROTJ Luke? No, way. So, I'm fine with SSC taking their time. Sure, it sucks to wait, but I want them to churn out some easy money with the variously colored Clones and easy EU characters (c'mon, Thrawn was soooo easy for them to make), so that way they can start dumping that profit into making a perfect Fett or Yoda.
Patience is key. Or you can be like the occasional posters here that just jump in and whine "Where's my Chewbacca?!" and demonstrate just how useless a post you can make.