It is a good idea but i feel your site will be abused developers will stump up the cash to pay people to buy their apps and not really care about the reviews by doing so this will push their apps to the top of the charts and will increase sales.
The normal process is to give out promotion codes for users to test out the apps and leave a review if they wish.
Even though your service does not force users to leave a positive feedback you are still bribing users to buy a particular application to aid falsifying the apps natural chart ranking, by stating if they review the app in anyway they would get a refund, I doubt many users would ignore this opportunity.
Aaron
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