Is it any less sustainable than having an owner spend a fortune on a new ground and training ground? Money he will only (possibly) get back if Brighton are in the Premier League for many seasons.
I fully expect all clubs to have complied with FFP after their accountants have worked their magic.
As far as I'm concerned, so long as a club pays their footballing and tax debts, I don't see that there is a problem. If an owner wants to spunk £10 or £20 million of their own money or even...