Is it immoral to steal from someone in a game?

Okay so I was just thinking about this the other day, you have a game, particularly Eve Online. Its one of those MMO games right. So anyways I am setting myself up to steal a lot of in game money from someone. Then I wondered, hey is this just as bad as stealing from someone in real life? I mean they do put time into the game and the game money has real world value. However, then I thought, but the design of the game is intended allow people to be thieves and spies and that which ruins lives. (i know i totally rhymed). I mean it wouldn’t be any different than exploiting someone in monopoly or deceiving someone in risk to gain the upper hand. As long as its an intended game feature right? I mean I know its not as bad as real life theft, but is it still a bad thing to do if the game was designed to make theft one of the designs of the game.