I'd just like to throw my support behind this. BUT I think the admins of Outpost ought to be more considerate in CS:GO's case. Since the arms deal update on August 13, Valve is not simply making money off of the Steam Market transactions, they are also apportioning funds towards cash prizes, which in turn is enormously helping CS:GO break into the larger scene that is currently dominated by games such as League of Legends, Starcraft 2, Call of Duty, DotA 2, and etc.

Valve has already pledged $250,000 towards (and only) the CS:GO DreamHack Winter event (which features other games as well, with prize purses of their own) . Here's an excerpt from an article which explains it better:
"Valve announced today (Sep. 16) that the 2013 DreamHack Steelseries Counter-Strike: Global Offensive Championship taking place at DreamHack Winter will feature a $250,000 community-funded prize pool. The prize pool is the largest in Counter-Strike’s history.
The funds were generated from in game item purchases."

And here's an excerpt from Valve's own CS:GO blog to further explain:
"We also want The Arms Deal Update to give back to the community, which is why we’re happy to announce the eSports Weapon Case. A portion of the proceeds from sales of eSports Case Keys will go towards prize purses at CS:GO community competitive events."

With the recent return of the huge and legendary eSports organizations like Evil Geniuses (EG) and SK-Gaming, and over 30,000 viewers seen at once on a single Counter-Strike Twitch.tv stream, the community is primed and ready to grow.

What I am asking, almost pleading, is that TF2 Outpost does NOT allow the trading of eSports keys. That they remain only purchasable on the Steam Market. In the long run, you would be taking away from the game: defunding prize purses, causing sponsors to pull out of the game which in turn leads to professional players dropping off, the community shrinking, and maybe most important, hurting the already struggling and small *North American* CS:GO scene.

If you aren't already aware, there's been an initiative within the community to bring Counter-Strike back to life in North America, it's been named NA Revival (narevival.com). But for the first time in Counter-Strike history, Valve is financially backing tournaments through their profits. This is a huge step and much needed encouragement for especially North American players and teams.

Over $250,000 generated since Aug. 13 to Sep. 16 (the DreamHack announcement) simply from one of their two types of keys.

Consider the larger picture, and how much might be taken away if/when eSports keys were conveniently and safely tradable or purchasable outside of the Steam Market. They would get duped (Russians already duped them and put them on the Market, but Valve removed them all within a week or two), their value would go down, and CS:GO would take a big hit in so many ways. The weapons case keys, according to Valve, don't contribute towards community-funded prize pools, but please keep the eSports keys off Outpost. You'd be doing an enormous favor (larger than you may know) for eSports in general, and especially for CS:GO.

Thanks for reading this.

tl;dr Please don't allow the trading of specifically eSports keys since a part of their sale on the Steam Market goes towards funding tournament cash prizes. CS:GO needs to grow, and Outpost would largely be hindering that and all the further results, such as sponsors and eSports organizations dropping off, and big tournaments featuring CS:GO and large prize pools become fewer and out of reach for professional North American players.