That ebayer is selling himself short, there’s two mechs and a headset on that frame too.
To OP, if I’m selling something thats worth a bit and I’m not in a hurry, I’ll start high and gradually drop the price if there’s not buyer out there. Really bugs me when people trawl the classifieds dishing out ‘advice’ for the seller.
Make an offer or move on. Seems simple enough to me.
Prime example, a while back I was selling a Litespeed frame on here. Loads of people replying to my ad with stuff like “£700 for a 5 year old frame, forget it m8 u cn get a new Poopdream for that!!!”
Sold it for £680 a few weeks later.