Dont get the Glazer hate tbh. Yeah prices have gone up, they do every year. Who can forget Martin Edwards blaming the season ticket increase on Roy Keane's new contract. That was classy.
As for securing the collateral for the purchase against the club, its no different to a person buying a house with a second mortgage, then renting it out and using the rent payments to pay off the mortgage, making a tiny profit plus the increase in property price. Its a common business practice, so long as theres a football team doing well, the clubs safe. With a club utds size (and global money power), it'd need a fair few crashes of Leeds proportions to ruin us, and lets face it, if we end up going down and going bust, then we've done something seriously wrong on the pitch.