Sounds like you're describing something more like a text adventure in the first place? You can use hyperlinks in text adventures, even turn off the command bar, so maybe that's the more flexible option for you? You'd get the inventory functionality, and wouldn't need to worry about "going back" after a turn.
Can't really answer the iOS/Android market questions very specifically as it's a bit unknown at the moment, as we've only put out one app so far and that was free. I've not looked into integrating in-app purchases yet either, which would be required for a pay-per-chapter model. I doubt you'd be able to sell a 50-80 page gamebook for any money, honestly - maybe better to put it out as a freebie to build up a following perhaps, then maybe people will pay for your next game.
Point and click puzzles would be possible with some custom HTML and JavaScript, so definitely an option to look into when you're more comfortable with the system. I can certainly help out with this kind of thing if you get that far