so its actually worth 1.8 k USD and you sell it for 300 euros is it stolen or something that you sell it like 4 times cheaper?
1.hacked maybe
2. Game bought when sale off or in bundle ?
Easy as that, I got 2043$ worth on my Steam Account, all legit offcourse, but I really only spend like 250-350$ on it as a lot comes from sales or Humble Bundle.
Selling it at 500$ would even be too much, like 300$ ball-park is more in spot where people will actually be interested. Not a lot of people have 1000$ or 2000$ in a sock for a random steam account.
Just looked my account up on SteamDB, indeed around the 2000$ range with sale value at 500$, 1100 hours playtime and 137 games, not a single ban. I guess 350-400$ would indeed be a good price for MY account. For OP account (also considering he has a ban on CS:GO) would be around 250-300$ and that is around what he is asking.