Dripping will attract ants, so eliminating that will help the ant problem. They are a good investment. Bees are really not a problem, I think, unless the feeding ports are too large and they are drowning in the feeder. Bee guards are available that would resolve that. I don't mind sharing the sugar with bees, which are valuable insects.
People get hysterical, however, about yellow jackets.
Just clean and refill your feeders in the evening after the bees have turned in for the night and you will have no trouble with them. These neat little contraptions are becoming more and more available. Check out my catalog of wildlife art at my new Catalog Preview page. Or you may wish to return to my Hummingbird page to learn more about these wonderful birds.