Stupidest thing you've done on Steam?

Btw u mey contact steam support to move game to another acc i did it with nuclear dawn XD 2 keys was activate

Buy WarZ

Purchasing game at full price

Trading. Lost all my Dota2 Items and got nothing back (a key was promised)

Created an account. Goodbye, paycheck!

Purchasing Global Agenda for 50 €.

Purchasing Fallen Earth for 50 €.

Both are F2P now and I got nothing for that.

Giving the trust towards developers who release Early Access games, believing everything they described, to then realised they lied. Before the game even reached retail it went Free 2 Play, losing around 25-50EUR per game. While no single update or fix got done.

Also developers who have no respect towards their playerbase, releasing a game for let's say 20EUR, to see the same game 1 week after it went on Steam on 50-75% already.

I didn't lose anything, but I did something really silly a while ago... I've put a trading card for sale on the community market, but I set the price to something like $300... Took me a few days to realize my mistake. :P
Other than that, the stupidest thing I've ever done was joining Steam. :-/

Got a suspension on my account and I was not able to login to my profile for almost 2 years....

Accepted an obvious SCAM trade.

Steam should really add the feature Good old Games (gog.com) already has. You can enter a Key and get a overview of what it activates, if it's still usable and stuff and then have so click on activate. I don't get why Steam doesn't add this feature - maybe to prevent key trading or at least hinder it.

create an account :(

Using cheat engine for singleplayer and then switch to multiplayer on a VAC secured server without closing the Cheat Engine client first; i don't use that account anymore, that "VAC ban" red sign haunts you forever.

Sold 350$ cs:go knife for 4$.

use hack and be vac ban

The stupidest thing i have done in Steam is to put in contact with Steam contact support.

At least three times that I can recall...mistakenly redeemed the keys for games that I already owned on other gaming platform(s) and had planned to give away.

I keep missing sales because I wait till the last day. When Steam says 'Ends on the 21st' it means 'The last day to actually get the sale is the 20th' and APPARENTLY I CANNOT REMEMBER THIS.

Going on steam during the sales, picked up so many games that I have yet to play and probably will never get around to playing...

I signed up. My wallet has never forgiven me.

In all seriousness (not that that wasn't really)... my first beggar actually got a game off me. I was too nice then or something, but now I want to kick myself for ever giving in. Guy continued to beg afterwards and even complained at me for saying no (...and to add to that, he noticed me buying something and complained I bought myself something, but wouldn't buy him something. He was serious). Lesson learned. Ah well...

bought a game called Breach

Failed to properly backround check a guy on a trade, ended up losing my Deus Ex Collection D: