Isn't it possible that proof of brain just doesn't work? I would venture to say that stake weighted voting and proof of brain failed when there is money involved. It was a nice idea but human nature and all that makes it work better in theory than in reality. Continuing down this path would be fool-hearty.
But to go down this path slightly... so you think the cure is for stake holders to spend their time on here sniffing out the 10 "highest quality" posts each day among the thousands of other posts? And we think that system will appeal to people? No one wants to come on here and spend all day searching through posts to find the "10 best", it's not fun, it's a job.
And what would compel people to invest money into that system?!
Again, I think you guys need to step back and ask yourself if this is more likely to bring in more people than it drives away? If the answer is no, or not sure, the idea should be scrapped immediately.