Well, Pocket chose the second. They bought Up for Renewal from a woman who had previously pitched the glass-blowing book and who “was working a dead-end day job and spending all her free time getting loaded. For lunch she ate animal crackers and Doritos from a vending machine, and for a midday snack she was having sex on her desk with a guy named Bruno who worked in the cubicle next to hers.” [Full disclosure: that doesn't sound THAT bad.]
It’s just one of dozens of books of weird things people do for a limited period of time, like not shop, eat local, have sex every day, etc.
Read more about this type of book here.