He's writing that he is advertising this elsewhere as well. I don't think he hopes to sell it throught eBay. The 40K is just a indication but not too far of. I'm sure it's negotiable. I agree that €570 per bike is too much but in order too make a good extimation, one would need to know what exactly is included.
I'm tempted to pay him a visit, would make a fun daytrip from where I live.