I'll admit they aren't cheap. We're paying a premium for those figures. However, comparing them to miniatures from some other manufacturers, the quality is very good. Aside from some of the mold lines and places where the pieces are connected to the sprues, there isn't a lot of work needed to get them ready for assembling and painting.
I've opened up boxes of plastic miniatures from other manufacturers to find flash completely around each piece. The details aren't as good and neither is the quality of the plastic. Visually it's quickly apparent the difference in quality.
So personally, I'm willing to pay a little bit more for their figures because I think it's worth it.