it's got something to do with all the licensing. Don Post is the company that puts the masks out, and they just flat out don't care about quality. It's sad. They've forced hundreds and hundreds of people into the myers maskmaking hobby, which is actuallly illegal believe it or not. William Shatner was the reason for the different masks throughout the halloween movies...the original mask was just a captain kirk mask painted white, but once halloween became big, he wanted his face removed from it, hence all the different masks in later halloweens.
I always preferred the H20/Reserruction one.