Going to leave this here, though it is not ebay but Marktplaats (Craiglist equivalent).
Had a buyer showing me the toy store link to a now retired product I listed, and demanding me selling him the RRP. Patiently explained to him it can't be bought in toy store anymore or even online internet store is selling 30% above my listed price. In fact my price is in the ballpark of other offers. Buyer retorted that it could still be bought in physical store and name calling (Thief)
p/s: Mod if it is not allowed to leave the name, I'll delete it.