Hmm... If you count my revision of Grim Tales (and it's still a bit early to count on that) this currently makes three similar projects in the works-- the third being the one
announced by Owen KC Stevens on the Paizo boards.
And while I am a fan of the patronage model, I am also a fan of the print-on-demand model, especially for roleplaying games. It's a huge waste to raise a ton of cash for a print run for a niche market.
Of course it's not the same staggeringly high patronage target as Stevens' project ($75,000) but if Sarli can work "full time" for a year at $10k, more power to him.
Theoretically, working under the patronage model simply to raise an art budget, working in my spare time (as always-- it's a hobby) and therefore taking no profit from the project other than what I see from actual sales, I could do the same thing for a fraction of the price.
For reference, a 400-page book with a piece of art on every spread-- extravagant-- would need 200 illustrations. I know a few illustrators who would love to get a piece of that art order and the book would look fantastic. (Not
Paizo fantastic, no-- but professional quality.)