I know two people who bought RPG books just to read them.
For media-related games (e.g., Star Wars d20, Babylon 5 the RPG, Stargate D20), I'm guessing the share who have no intention to ever play it would be higher.
Myself, I buy tons and tons more adventures than I'll ever use. Partially, it's because they are fun to read. Partially, it's because you have to throw back a lot of fish before you find the one adventure that's just so "right" you want to run it/mess with it and then run it, at least if you are me.
For media-related games (e.g., Star Wars d20, Babylon 5 the RPG, Stargate D20), I'm guessing the share who have no intention to ever play it would be higher.
Myself, I buy tons and tons more adventures than I'll ever use. Partially, it's because they are fun to read. Partially, it's because you have to throw back a lot of fish before you find the one adventure that's just so "right" you want to run it/mess with it and then run it, at least if you are me.