Non taken. If you feel the price is high, feel free to make an offer.
My only reference for price is the price I see on eBay. So I check what the asking price for it is, and ask slightly less.
Edit: Thanks for the feedback, I checked eBay price history and I see that indeed the current asking price on eBay isn't a good representation of the actual going price of these. Therefore I will adjust the price accordingly.