It's all relative though. £720m may be an enormous figure, but for a club with the potential of MU it's not insurmountable.
In comparison the much smaller figures owed the majority of lower league clubs may not be so, though one could, quite rightly in my opinion, accuse some of being overly optimistic. Not only in offering players unsupportable contracts, but also building grounds beyond their needs, e.g. Darlington's 20,000 seater . . .
. . . the running of which being part of their financial problems.
By contrast HU's plans are considerably more modest. Yes I would love to see a new ground built, and with the
Edgar Street Grid Project I cannot see why it can't be done, but I'll be content with the development of both ends, which should see the capacity back to the 10,000 mark. (Alas football has changed from the working man's sport to corporate business, so I doubt I'll ever see a return to the regular 10,000+ gates).