Now trading is all:

1. People backing out- You get a offer then the person retracts at the last second obviously using you as a fast and easy way to price their hats.
2. Bp.tf users- All you need to do is get your alt's and your buddies and their alts to vote down any hat you want and vote up any hat you have.
3. Quicksell buyers (most of them)- Because they are wanting quicksales, when a quicksale hat is offered to them, they think it is the actual price on the hat then (kinda like *cough**cough* bp.tf) they cause endless drama on trade servers screaming "that's not a quicksale" and end up lowering the value of the hat for those that invested a fair price for it.
4. Scammers and sharks who easily take advantage of people, scamming is bad, but sharking is perfectly acceptable.
5. Dupers/hackers/phishers/ with an internet connection or a local internet cafe.
-some cool guy i came up apon in the forums