I'd never thought much about film options, only knowing about one writer who had one (not counting my great aunt who had a movie made from her book back in the 1940's). However, last month, I was able to learn much more about options. Many of the writers I knew had them (I just hadn't been aware of it), and I was able to talk at length with a producer who'd optioned many books (and is now making a movie from one of them). The range of numbers paid for them were between $5,000 and $50,000. The nice thing about them was that in many cases, the options just kept getting renewed.
I don't see an option on my horizon, but I'd sure accept one if it came a'calling.
Physical book registration has one price. E-book registration can be done on-line and is $35, I think. Do note that many here don't bother with the registration until things become interesting, or until they begin reaping some actual bucks from their writing.
Is it not customary to ask for an upfront fee and then a % on the gross benefits of the film?
Now, if you sold 1000000 of your book, the producers who contact you won't be the same as those who will contact you if you sold 100000 of them, and again won't be the same as those who would contact you if you sold 100 (in which case anyway I don't see how someone from Hollywood would contact you, except if your name is B. Hiller ). So the amount of money you'll be able to ask won't be the same either.
But if Spielberg calls you personally, and offers you no money but is willing to take an option on your book, then go for it! I would!!!