Part work modelling, where you get some of the kit on a weekly/monthly/whatever basis, is pretty common in the rest of the world. But relatively new in the US, anyway. I'm sure people are impressed by both the model, and its price!
But I think some of the complaining I've read other places is a bit overblown. It's a big, well detailed model, and you're paying premium for both the Star Wars license, and the option to to get it in smaller, easier on the pockets bits. The main thing that has held me back from this kind of thing is the level of commitment necessary over that period of time.