seems you haven't spent much time on castercity.com. I think you'd be quite surprised with the cost of their fancy stuff. hell, even some of the less than 1T industrial stuff is 100 a piece.
not trying to justify it, as much as point out its not as silly as it seems in the grand scheme of caster things.
still - apple being apple, so easy to fire shots
well sure if you spec em crazy enough, they have plenty that are already way overrated for even the biggest of caselabs cases well under $50. And their prices don't seem especially great compared to what I'm used to seeing.
So yes, paying $100 each for casters for a freaking case is completely mad unless you're filling your case with solid lead.