Well, I recently launched my paperback book, and I sold 500 copies in two weeks from my page alone, and I'm going on the second print run already. That's not a lot, but it covers my cost, and then more. I have a special situation (small loyal following) that might just tilt profitability in my favor.
I have female friends who've expressed interest in shooting with me ($500), and I've already had several offers at $250 for the filmographers. Add some miscellaneous here and there, and let's call the expenditure $1,000.
I can sell it for $10 pay-per-view/downloadable, maybe $12 for Full HD version. I don't think it's impossible to cover my cost given the strength of my following.
As for legality, I've acted before twice for studios, and I had the opportunity to see how they do things. It's not the best guarantee, but I'll definitely seek a lawyer's advice when the time comes. Thanks for that heads-up.