I've bought a few things from zzp, and even though some of it is pricey, it's been good materials. For example, for the fbody brake kit, I know I could just go to a parts store and get some camaro calipers and do it up myself for a lot cheaper, but they handle the bracket threading that I could possibly screw up to make them fit.
And every store has an assortment of crap with a crazy markup that's only there cause they know a few uninformed or loose-spending people will grab it up and pad the stores bottom line, whether it's auto parts, groceries, or clothing.
They cater to a niche and can demand the price the community is willing to pay. They're not perfect, but over the years I've had no major complaints.
