Knowledge, in terms of scouting networks, each club will have a scouting network in their own countries and those surrounding. That would mean Everton don`t need to employ and send scouts to that region, that will cut costs. Clubs will also hold scouting reports on teams, how they play etc, if we ever get back to Europe who is to say we won`t need an insight in to an Italian or Belgian club.
Resources i.e. players, would Dobbin or youngsters benefit from a loan to Standard and 1st refusal on players on their way up, as published earlier there are Premier League clubs circling some Genoa players.
The business model like you say is on a knife edge, this is the biggest concern. I`d like nothing more than a wealthy billionaire with a vision to grow the club and the revenue but we have to accept no-one else wants us, the club is just not attractive even given the clammer to buy PL clubs. Good things don`t happen to us... we will forever be Also Ran FC whilst all other PL teams get bought by wealthy entities and leave us for dust.