Anyone have a pool where mining on it is basically -ev but the payouts for even low MH miners can be high?? Not sure how pools work really but if my imagination is correct miners of a pool can work to create a "share". What if the closer your last share was to the pool solving a block, the higher your "jackpot" payout? You could reward miners like they do with a poker tournament. Perhaps this wouldnt be -ev unless you were CPU/GPU mining vs a massive diff, but I do think there are people willing to spend electricity to have a chance at winning a lottery.
Try Ozcoin's "Pay on Target"
The reward method is fair, so you actually get paid (over time) what you'd expect, but the payouts are based on how lucky your share was. So it's exactly what you want, without the negative ev.
