1. It's funny and shows Zeus in a way you've never seen him before.
2. Perverts are fun to read about...and you can't get much more perverted than Zeus.
3. It only costs $10.
4. I can't take much more of the library, and if enough people buy the book, I can quit my job (and actually have time to write plays).
5. Where else can you see a god use the word "cockblock"?