I don't think its optimistic, bearing in mind the price I paid them in the same condition that they are in now. Just because they didn't reach that price before, doesn't mean that they aren't worth that price. I put that "they're around £400 new", so people may have assumed that I had a higher reserve than £150. Its minor damage and as stated, once they're on the car you can't see the damage. I wasn't that fussed, so I fitted them as they were. IIRC, the first time I sold my alloys on there, they got to £58 or something similar. When they were relisted, they got to £600. It depends on who is looking at the time.
Are you honestly trying to say that they are worth no more than £5? If not, what do you think that they are worth?
The £400 new (or whatever they are) is the price on standard skirts, with no colour, so unfortunately, you presume wrong. Colour coded and fitted, you'd be looking at around £100 (at least!) on top of that, so I don't think £150 is optimistic at all. If you went to Mercedes to have them fitted, i'm guessing that it would cost far more than the £100 to get them sprayed as well.
Its considerably less than I paid for them, although in fairness I did pay more than I probably should have.
If you aren't interested in buying them, please keep your comments to yourself. If you have a problem or query about the price, feel free to PM me, but I don't go to the adverts and say "they're too expensive, they aren't worth that etc", as its not fair on the person selling them.
Regards
Dan