You cannot draw the line
With sharking, there is no clear line to determine if something was a shark or not. When is something a shark and when is it a good deal? It's an entirely grey area and the decision will vary depending on who is judging. Scamming on the other hand has a very, very thin line, since it's either you get something you wanted or you don't.
Sharking is not illegal, it is a moral subject and we're joining SteamRep's stance on this one - we have no intention of touching it as it's completely up to the opinion of the judge, which can vary a hell of a lot. There is a huge chance a total newbie could shark by absolute accident (these things can happen, think back to those old days of TF2 when trading just came out and prices weren't exactly set in stone in people's minds), and it'd be completely unfair to him if he had a mark for life because the moral police noticed what happened and came after them.
Nothing constitutes value in an open market
The prices are not defined by Valve, nor they are defined by spreadsheets or any other price lists. The prices that are listed are almost always the average market price, as in what people are buying and selling for. Are you even sure lil' Timmy even wanted those earmuffs when he could've had a cool laser gun?
Once you click Make Trade on the Steam Trade window, you have agreed to trade your items for theirs.
Loads of people do it
Only the loud ones who boast actually get caught. Do you have any idea how many sharked unusuals are on the market? Do you really think everybody has the patience to wait months and months for some sucker to take on their bad deal for legit to make profit that way? Ever noticed how there's always a bunch of people with an unexplained amount of salvaged crates?
• Typing "gibe" into Google brings up the first suggested result as "gibe hats pls", followed by "gibe everything pls" in number 4
• Furthermore, typing "gibe hats" will bring up many related results, including "gibe hats pls alternative", meaning enough people have searched for this phrase for it to show up in Google's suggested results
• Typing "jessecar96" into Google brings up another good suggestion (not a personal attack - this is what everybody calls it by)
• "up to no" as well brings up a perfectly suggested result
• 1,280 unique users are already using the most recent online scanner solution
A few months ago I tested it out for myself with some Earbuds and a fresh alt account. A LOT of people added me or traded in-game in an attempt to get my item for dirt.- I didn't even have it equipped so it was obvious they were using a scanner. I also had a lot of fun getting them to go out of their way to acquire hard-to-sell items to trade for them, but that's another story. While there are some people who added me, I figured some of the more intelligent sharks would've realised the massive difference in the item's current ID.
They do not affect people who know how to trade
So why ban them from a trade site? It's not going to accomplish anything. Outside of sharking, sharks are generally pretty fair traders and are more likely to be less stingy than one who does everything the hard way, thus won't get snappy because you outed them by a single piece of scrap metal. Items such as salvaged crates and other popular rares are easily sold anywhere, even on trade servers - it's just not going to solve anything. And do you really think you're going to keep track of alternate accounts?
As other trade sites ban sharks, we are the last bastion for them. However, this does NOT mean we are catering for sharks, we are simply neutral to them. As we say, if people know you are up to no good (hah), then your reputation as a trader is at stake and you may lose some customers. But, since you are getting $10+ rares for dropped weapons, it's probably for the better.
(If our target audience WAS sharks, wouldn't we have a few server/friend scanners in place?)
Judging based on moral values leads to the creation of a Orwellian society
If an issue occurs and the answer isn't a straightforward black or white yes or no answer, then we don't want to go into it. We do not like Orwellian communities as they are destructive against free speech, but there are a quite a few of them in the TF2 trading scene. If you like going out of your way to find black sheep to incriminate them as much as possible, that's fine, but don't bring it to Bazaar.
Sharking is actually a European sport
Please stop misusing our word. It's an awesome sport too.