There is currently a thread going on about this exact thing. People need to stop relying on what other markers sold for and start offering realistic values.
FYI, DYE resale value isn't fantastic given that the company releases a revised model every year so the value of the previous generation of marker depreciates accordingly.
PE markers are a different matter.
Moreover, all Scottish Warrior markers are priced in the £450 to £500 bracket. Every other seller selling an NT10 or NT11 price theirs anywhere between £400-£475. I am well within my right to offer what I think is a sensible price and I do not need you to implictly imply that I am a lowballer with your passive-aggressive post, thank you very much.
Rider declined my offer, I am not willing to pay much more. Let's just leave it at that.