Yup, everyone else on the planet would be incredibly happy to sell the club having lost money for a value vastly, massively under whats its worth, how utterly horrible H & G are.
End of the day, you buy a business worth £400mil, get a big loan to get it, pay interest on the loan, increase the revenue of the club(supposedly pretty dramatically, which meaning excluding the debt its now worth more than £400mil, a number I'm making up as I can't remember how much they paid for the club). Anyone would be unhappy to sell the club for an amount that covers the debt and not much else, it would mean you've lost millions upon millions. Of course, I don't know how much the revenue is up because of better business management, and how much is down simply to increased money from tv/ticket prices which almost anyone would have got. Considering the last shirt deal they got, it was very good business, considering the clubs success and lack of real competitiveness to get money for shirt sponsorship and the like at the money they got, was good work. Lets be honest, they shouldn't be anywhere near the same league as Utd/Real/Chelsea in those area's, Arsenal have no excuse, our shirt sponsorship deal is a complete joke comparitively, 10mil a year for shirt and stadium while those other guys are mostly on 20mil + a year for shirt alone.
H&G couldn't afford to buy the club outright, and don't forget the market crash severely dropped their cashflow meaning sorting a new stadium which would long term do what it does for Arsenal, allow the club to easily pay off that debt isn't exactly their fault, the fact that after the stock market crash they don't want to write off millions letting Liverpool go for nothing, is a rather daft thing to "blame" them for. I can't think of a single other person on earth who would be happy to lose the club for less than they paid for it.