I voted based on experience from planning for our trip this summer. Vote: I'll pay next time for books, but not internet info.
I bought the UG, thought about Passporter but did not buy it (though I probably will next time), thought about TGM but passed on it, then bought the sample online touring plans from the UG website (because they were pretty cheap). Next time, I will definitely buy the UG book, most likely will buy the Passporter book, but will most likely not buy the online UG plans (didn't use them in the end), and still probably will not want to pay for TGM's website.
In the end, I don't mind shelling out for a book, but can't bring myself to pay much for internet-based info. Don't know why, but that's how I'm wired I guess.