+ Reputation is what?
+ Reputaion is for anyone who gets "+reps" for being a friendly person or a very good online player!

Pointers when dealing through a steam trade:
1) If people are writing in very bad english, don't trust them.
2) If they are called [unassigned], don't trust them.
3) If they haven't yet setup their profile, don't trust them.
4) If they are in a hurry to trade, don't trust them.
5) If they send you a link to their offer, don't trust them, and DON'T click on their link.
6) Pay close attention to people with Private Profile or an empty Inventory.