Did he pay the market value on it? Of he didn't then obviously that's something that should be stopped, it wasn't making any money for the club at this point though I'm guessing?
Yeah you're right. But its land nufc could've developed and made money from, or expanded the ground if the need ever arose. Now its going to be student flats which he will benefit from.
Just to illustrate how little interest NUFC holds for him,
A couple of years ago Ashley bought a patch of land in London for £140m to develop into flats. In order to get planning permission he paid a further £40m to relocate a school nearby.
Newcastle is small change to him, one of many interests. As long as the advertising exposure is there for his retail empire he's not arsed what happens.