[Karellen]

That... actually makes sense to me. You're gambling the cost of the book that the amount of enjoyment you get out of it is worth the time it took to read it.

If you enjoy the book, your payout is those feeling of enjoyment. If you lose, the price is the cost of the book and the time you wasted reading it - but you have the paltry consolation prize of a now-second-hand book that you can sell at a loss to a used book shop.

And you can affect your odds of winning or losing, by going with a genre or author that you already have an affinity to (or not!)

[the_af]

Unfortunately, that definition of "gambling" is so encompassing that it effectively means everything is a form of gambling. Which is, of course, absurd.

I could be said to be gambling that my comment will be read. I am also gambling that someone will not disagree with me. I am gambling that by writing this comment I'm not wasting time that could have been better spent in other endeavors. I am gambling that I will not die of a stroke just after writing my comment, making my final conscious act a pointless one.

If it sounds absurd, that's because it is. Of course it's not gambling, and neither is reading a book.