Unless your doing a lot of advertising and showing up for swaps, I say **** the license. I'm zoned county outside of Bunnell, Flagler County and at least in this area those laws are never enforced, but my area is small. I don't recommend displaying a bunch of ducks, geese, quail, pheasant, etc. at the swaps in barberville or bunnell, though- when the G-men crack down on stuff like that they don't give you any warning. They just take your birds away to be euthanized and leave you with a big fat fine. All it takes is 1 ******* to complain to FWC. There are a lot of strange exceptions to the game bird law, like no permit needed for toucans, bison, etc. You can also keep up to 49 bobwite quail without a permit, because they are native.
That said, craigslist is a good way to stay anonymous and sell ur game birds. This is an old thread but a front page google result for "selling ducks license Florida" so I figured I'd contribute. If anyone in my area is interested in chickens, I usually sell chicks locally- I got some laying breeds like RIR and Australorps- people buy a lot of sexed pullets. I got Egyptian Fayoumis; great foragers and they mature quick. I have O Shamo (wheaten) but they do all carry the recessive allele for mottled, my broodcock is mottled so the odds are good on the chicks. My wife has various Bantams as well. I sell about 50-100 birds a month, but most of them are layer pullets, again people in my small area haven't been interested in paying what my Orientals are worth.