During the Steam Summer Sale, multiple topics appeared here with people willing to sell Steam games for CE. Initially the rates were 500CE/$, but it increased and stabilised at about 600-650CE/$. I only ever saw ONE topic where a buyer was willing to pay 800+CE/$, but that was most likely because he desperately wanted to get a game and its sale was ending soon.

Looking at this, 750CE/$ is pretty high for a 'normal' sale, but it isn't so bad to be considered extortion, and Tekno may very well find buyers since there is practically no one else doing Steam game sales right now. It's just that in this case, Tekno's the seller, not a buyer, so people are easily put off when they see his high conversion rate (which people only offer during large Steam game sales). Tekno, I highly recommend you lower your price to at least 600CE/$ (which is still considered high, 500CE/$ is considered the normal conversion for a time like this) if you want any hopes of getting buyers - Cryo is right: in saying that the playerbase here is small, so putting a high price won't net you any buyers for quite a while, especially now that CE is so expensive in CR. This is not TF2 - comparing prices of anything else other than refined metal is silly since the items in both games are mutually exclusive.