Overplaying Giroud is a result of not signing a striker after being rebuffed in his effort to sign Suarez (who he bid for after signing Sanogo) so actually has nothing at all to do with his economic philosophies but more to do with his and the club's general ham fisted incompitence when it comes to the transfer market.
And Giroud isn't shit because he's been overplayed....i don't think it's fair to give him that kind of out, he's shit because he's shit, slow and lazy.
Other players are injured because they have been overplayed and this is despite there being squad depth to rotate more often than he has...(no need to play Ozil against Coventry for instance)