Oh dear, they are a novice ebayer... the buy-it-now option drops off after the first bid. If there is no reserve a usual strategy for an experienced ebayer is to bid £1 to kill the buy-it-now and allow low bids... then come in late with a killing bid below the buy-it-now if poss. They will probably end up selling this for far less than they expected but my £3k estimate might be a little low.. i doubt it will get to £6k tho.

My £300 guess at delivery wasn't far out then!

This would be a good buy for a small company at the £4k-£6k mark. If thats in your budget range and you need a 850x850mm work area then go for it, but for a hobby machine its overpriced unless it comes in well below that, you can build or buy something similar for a lot less. A 720 x 420mm work area system can be had for under £2.5k

Remember there no warranty or support with this... if you buy new you get some element of that.