How much do you need? A developer whose games they were selling without permission? https://twitter.com/devolverdigital/status/466577590606520320 A confession of violating the terms of services of where it was getting some of its games from ( http://www.gameinformer.com/b/news/archive/2014/03/28/retailer-scam-resells-humble-bundle-games-reaps-profit.aspx ) and then continuing to do it after promising to remove them all? Or how about asking developers for free review copies with multiple accounts under the guise of streaming/publicizing for them? These things and stolen codes magically end up on G2A for sale and it's not just "the users" (g2a has their alts too for protection).

Also note that a reseller is only an authorized one when it gets its games directly from the publishers. They (for example: Activision) "authorize" that store to sell their games (COD) and in return get their cut from each sale. But G2A cuts out the publishers and uses bundles and sales to make their profits.

And even if the games cost G2A nothing, they make profits off of their illegal Shield 'service' which is essentially getting their other users to pay for your loss if the cd-key doesn't work like health insurance. They do this not to help you but because they cannot ask the publishers directly for another game key because they're unauthorized.

Besides not getting the best deals you're just supporting crooks. Whether you decide to continue buying from them anyway is your decision to make and your own 'shame' to keep or fix. I hope you at least understand why they're a problem along with other cd-key-store websites.