The only catch is that it's at the bottom of a box that's about waist-high filled with wasps (not just a few dozen flying around; I mean literally filled with live, angry wasps). To reach the cash, you'd probably have to bend low enough that your face gets in the box.
You won't die from the stings, and no permanent damage will be done to your arm. Would you have the balls to grab the money?
Edit: You have to do it naked and you can't use any sort of chemical to kill/sedate the wasps.
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Camp out next to the box, drink as much as possible. Pee on the wasps at every opportunity. Repeatedly do this until they drown in your pee. Pour the wasp-pee concoction out and take the money. Problem solved. Richness attained.