Positive feedback to mean something
There's no incentive to do above and beyond the expected work. Positive feedback does nothing (don't say the wheel), while negative feedback hurts. If an expert can get a 100% ratio of positive feedbacks for the month (over perhaps 100 we'll say) they should get a 5% bonus on questions they answer for the next month. Something like that would encourage the experts that do the bare minimum to work harder thus not chasing as many customers away. Or increase the chances on the wheel to realistic amounts. This won't hurt JA since it encourages experts to take more questions and do better work, in the end the payout will be higher.
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Kevin Kappler Ph.D. commented
My wife recently used your service and she was amazed that there was no way to rate the expert.