Re MAG it is a very simple formulae.
IF they suspect it can make money they will build one.
If they don't, they won't.
Manchester has a massive population on its doorstep but Stansted is surrounded by fields, plus all you have is procession of diminishing RYRs , would that keep interest going ?
I suspect not personally.
The AVP at Manchester is franchised out, the operators TAS pay for a licence which in turn is paid for by the hefty parking, restaurant licence and educational visits etc.
I do have another thought however if you have any aprons you could always turn it in to ..........................(deleted)