They've already made their funding goal. So it's stretch goals for the next 20 days.
From the campaign:
On A Roll: Leveling Up Your RPG is a book of theories, wisdom, tips and advice for players and game runners of all experience levels. It's an exploration of everything I've learned in my 25 years of gaming that can help you have more fun playing or running your tabletop, LARP or MUSH game.