Re: Book projects generally work out
No-one at all should back book projects.
The production cost for an ebook is simply the author's time.
A glossy colour coffee table book costs as much in postage outside the USA as the proof copy. POD is cheap.
Board games cost more to produce. However a playable mock-up can be done for less than posh night out for two, so only back ones that have already been prototyped and playtested.
I agree, do not back any sort of gadget unless you are a rich expert and getting real voting shares.