It's not price segmentation. You can encrypt X hosts with a wildcard cert, and X can be any number. So you basically buy encryption at a flat price, which can save you a LOT of money.
Fair enough; maybe the term isn't correct. My point is that a wildcart cert is technically no different than a 'regular' cert, and the CA incurs in no extra cost, unlike with EV certs. The price difference is purely based on the fact that buyers who need wildcart certs tend to have larger budgets.