I think it's an interesting albeit somewhat odd approach to take but who knows, maybe FL will learn some great tips on how to find them in the wild!
They sort of do but it only runs once month (I think) out of the year: http://pythonchallenge.org/
Teams have to pay to enter and they have a contest with cash awards for longest/biggest caught. Not quite the same as a bounty per snake but people can still get money for hunting them.
The issue is that not a whole heck of a lot of them are found (since the numbers supposedly in the wild are generally believed to be highly exaggerated).
I do like the idea of selling the skins or something so at least there is some good to come out of it (besides getting the invasive species removed of course).