$500/month to protect against a 0.1% chance of being sued by a patent troll over a 7 year period gives $42 million in expected value to fight a bogus patent when it does come up. Adjust the numbers to whatever's realistic.
It seems more sustainable than asking strangers to fund patent lawsuits.
What we are focused on right now is on diminishing patent portfolios so the lawsuit probability goes down. We have a lot of things in the pipeline that will make it easier for companies to be protected using Unpatent, that don't necessarily involve backing individual campaigns.
That is what I had figured... as an aside, I have been hearing complaints about young lawyers not being able to earn very much due to over saturation of the market- but it still sure costs a bunch to higher one of them! I would think if the market was so over-saturated, lawyers would lower their prices to better compete. (Of course, the various specialties may still have variances based on expertise). The over saturation thing must be a myth being spread by old lawyers trying to protect their earnings by discouraging new competition :)
Insurance that covers only legal fees should have the opposite effect.