The way I usually see buisness deals go down is:
Party A has something they wish to sell/trade
Party B has the goods/money that your looking for your sale/trade
IF party B asks party A to name his Price on how much he'd like for said items, it makes sense that Party A would absolutely throw out an offer thats somewhat fair, but still on the higher end of the spectrum. Its human nature to want a bit more. This is where the dealing aspect comes into play. A typical reasonable deal in TF would go something like this:
Party A: 'Ello guvna, ive got 1 hat for a heavy to trade ya!
Party B: Good morrow fine sir! How much for said hat would you like?
Party A: Well I twas lookin' for somethin' around 2 Refined for it!
Party B: Thats slightly higher then I was looking to trade good gentleman, how about 1 refined and 1 reclaimed!
Party A: Thats a fai' offa luv! Deal!
Party B: Good show ol' chap!
You notice that while party A offered higher then the normal price of refined metal (essentially the currency of TF2) Party B was able use COMMON SENSE, and NOT FREAK OUT (this is key) at the offer and deal so both ppl were happy w the trade
Now this is example 2 of the average TF2 nerd and an almost verbatim trade that I had go down
Me: Hey man, you were looking to trade for this Unusual Hottie's Hoodie Ive got?
TF2Nerd: Yeah, how much you looking for it?
Me: Around 8 buds
TF2Nerd: ......
Tf2Nerd: Did you just fucking say that to me?
Me: What?
Tf2Nerd: Did you just FUCKING say THAT to ME!?
Me: ...wtf?
TF2Nerd: HOW DARE YOU ASK FOR THAT SHIT! I HOPE YOU FUXN CHOKE ON DIX YEW FAGGOAT!
Trade ends.
This is the average TF2 trade.