I paied my AX-1 250 euros and I considered it a quite high price for such instrument...
I should put mine on ebay when I'll decide it'll be the time for a new car
That's not a real price. It shows all the traits of a shill bidder with zero feedback, is a new user, and who's overbidding. It seems to be someone bidding on behalf of the owner. Happens all the time and ebay gives legitimate bidders no way to identify shill bidding on their own.