* Is reselling those digital accounts legal as per the terms of the said video game?
--Selling/buying anything related to any online video game is always against the video game's TOS, but not illegal in any country to do.It is a billion dollar industry. For example, eBay forbids it (they claim copyright issues), while PayPal welcomes it. So you could say it is a "gray area" type business that has been around without issues since the dawn of early internet games such as Diablo and WoW.
Not true. For example, CS:GO's item trading is not against the game's TOS; Steam has a whole marketplace for it.
My bad, I meant majority of games -- even Diablo 3 once allowed this if you used the auction house they provided -- which later was discontinued.
I have experience in selling digital assets for economy based games such as Diablo 2, Diablo 3, World of Warcraft, Runescape and a few others -- all in which it is against the TOS to trade outside of the game.
Never played CS and personally never was a huge fan of the Steam interface.
