This is pretty much the only instance of any inequality between men and women in the Baha'i Faith. That being said, it's often mentioned and is rather a tricky question to answer since the reason isn't given. The only explanation is that one day it would be plainly apparent why it was set up this way.
And to serve on the UHJ doesn't imply power, influence, or being better in any sense whatsoever. One can think of the elected administration of the Baha'i Faith as sort of an upside down triangle - to be serve on the UHJ is to be at the bottom in a position of absolute service.
edit:
Dave - yeah, I was specifically thinking of the education part when I wrote the "pretty much". I guess I think that it less of an equality thing, and more of a "the sexes are different" thing. At least for the education part, I believe it was done that way because women are the first educators of the children, and so if it is only possible to educate one child, it should be the girls. In either case, if viewed as "unequal", it would be so in favor of the women.
edit #2:
I guess it can be if you really want it to be. The crux of the issue is that none of these laws were put in place to degrade women, but rather to lift them up. Above all though, I think it is important what *you* think. You are 100% entitled to the belief that the sexes are unequal in the Baha'i Faith. I'm glad that you have the courage to investigate and ask questions. Good luck on your search