If it was about paying an examiner to dig up prior art, they could just do that privately. Crowdsourcing like this is typically much cheaper, but putting money aside, many people would be happy to help simply out of principal. There are lots of people who want to see patent trolls eliminated and they would spend their own time to do it without expecting to be paid for it.

If you would only consider doing this as a form of employment, so be it, but many others are happy to do this just to try and make the world a better place for us all.