I don't think there is a "correct" price. People are going to pay what they think something is worth based on how bad they want it/them. They aren't worth $3,000 to me. I can build them identical for a lot less than that with "upgrades" and have them look identical down to the emblems on the front (sans stickers on the back). They would sound the same as original, too. Or better. To build the cabinets, it's less than $200 worth of wood, glue, screws, cloth, etc....it's just time in doing it. Drivers can be had new and used. It's not rocket science for me to build cabinets.
So, for me, I'm not going to spend a lot on a pair because it's just not that important. For what I've seen them go for through the years, $3000+ won't happen with me. But there's a buyer born every minute.