It's not a bad price for a Moore #2, but it isn't all that stellar either. They regularly go for between $900.00 and $1,500.00 in our area. There's a # 1 currently on eBay for $500.00, and a #2 for $750.00
A couple problems I see are, first I doubt the person selling it has ever used it, or has any idea of it's condition since they listed it as a "milling machine". Secondly there is no tooling. Even the most basic tooling would cost the new owner at least the same amount as the seller is asking for the machine.
I'm betting the machine was either bought as part of a lot at an auction, was left in the building when a tenant moved out, or it was originally part of an estate sale.