Addendum

But then when you try to claim your coupon, you have to answer some questions about the book. The answers are changed regularly for security reasons. This process may sound like a hassle, but do you want people to read more or not? What do you mean, "not particularly?" Well, yeah, I guess, when you put it that way.

Addender

On a related note, wizards are always getting hacked because they think they're smart, whereas clerics know they aren't and keep to divine security procedures.