(Fighting hard against sarcasm ) If you are going to get in the SS game, you need to give up the notion that "Tossing someone $10 a book" is either doing them a favor, or the road to getting what you want done, done. Back in 2007 you could do it that way. But the guys who have made it through are hobby-loving businessmen, and while they love to help collectors, they still need buy them Huggies. And Revat laid out the costs above, plus they have overhead (witness expenses, website etc.) and profit to consider. If you are serious, you need to put together a financially satisfactory package. Otherwise, you need to find an already-being-attended O'Barr appearance and then $10-20 bucks a books will very likely get it done.
Also, your language is contradictory, so you are going to have a hard time getting people to mobilize. Posting "Witness Needed!!" and then later saying "I'm not asking anyone to go out of their way" is completely contradictory and you don't want to get a reputation as a wolf-crier or a flake.