Price seems high to me. Not an expert, but here's a brief description of the Moto line-up at
Classic Rendezvous. Mirage is listed as second from the bottom (entry level). Did a Google search and found someone who claims he bought a Mirage Sport new in 1981 for $185. As far as the Campy stuff, I'm no expert, but I think older Victory and Chorus were entry level (doesn't mean they don't function well, just doesn't make a bike worth $250)