For most people, using MSconfig and changing permissions isn't easy. Bootskin makes it so. It also provides an easy way of creating and sharing skins.
MS didn't provide much flexibility to the users. Bootskin does what it can.
As to feeling disappointed and ripped off . . didn't you look into it before you used it.
As an aside, you either got the free version or as part of ODNT. I hope the rest of the suite (at it's fairly low price point) makes up for any feelings you may be having.