what are these wheels worth?

Yes, you should have if they had good caps and original style trim rings.

No, like I said, I was referring to the SBP center caps ONLY. And yes, I could have picked up as many sets of them I wanted at $100/set, so it's partially about the market. If some people are willing to pay $200 for a set of 4 SBP acorn centers, then they obviously aren't people who are out going to swap meets, at least not the same ones I do. Maybe on the coasts, prices might vary by location, but to say without question that they are "worth" $200 for 4... well, not in the midwest the past couple years, no, they're not.