It is worth it. Powder will hold up way better than most paint. I have powder coated a lot of wheels. I HIGHLY recommend clear coating all wheels for protection. I use a very nice high gloss clear powder. You should contact @CudaChick1968 and ask her to do your wheels. She does amazing work.
It is fairly pricey because wheels are a pain. For their size, they take a while to do. I will do wheels, but they are a pain, and I charge accordingly.