Derbyshire makes good lathes (they're even still in business). The value is hugely dependent on condition. It's tough to tell from the picture, but if the lathe is pristine (as well as the collets), probably worth north of $1k depending on tooling (a complete set of pristine collets can run $1k). I paid $1600 a few years ago for a Boley-Leinen lathe, but it was extremely well tooled--full set of as-new collets, dead/live centers, etc.
Using an active Buy-It-Now listing like from fleaBay IMO is a poor judgement of value. It ONLY shows what the seller wants and NOT what the world will pay. A much better price realization is to check the completed listings in fleaBay.