I've been thinking the same thing but the numbers don't really stack up for investors unless you make the season tickets start at £800 per season and even then it doesn't leave much for the club.
I suppose it depends on how you went about it. Whilst a die hard fan won't want to lose their shirt, they could probably settle for something a bit more emotive than a cold blooded investor. It's just back of a fag packet stuff of course, but a little creative thinking could come up with something perhaps?