In my dd1's elementary, there are mostly moms at the PTA meetings - though almost every dad belongs (has paid dues - all official PTAs that I have ever heard of pay dues). At the meetings, it is usually about 3/4 moms and 1/4 dads. We have some very involved dads and their kids (and all the other kids too) benefit from that.
My dh has gone to..... hmmm... I guess I can't remember him going to any PTA meetings. It is cheaper/easier for one of us to go and one stay home with the kids. Our meetings often go past the kids bedtime so even though there is sometimes childcare by donation, it isn't something we generally take advantage of.
To the poster who was offended by the $5 dues, you don't have to pay or belong to PTA to volunteer at school. You have to be a member to vote on how money is spent (as another poster said).
My dh, even though he doesn't go to the monthly meetings, is very involved. I volunteer him for many things.
He enjoys doing more "manly" jobs where tools are involved. Fine with me and that is needed so why not? He also chaperones field trips, helps with field day, moves or builds stuff, etc. He doesn't have much experience with whether you'll make more profit selling wreaths or gift wrap; he doesn't know the specifics of her classroom and what they need in what order of importance. Maybe it would be nice if he did. That is more what I am "into". I think that is ok. He is very involved in the kids' education in the ways that work for him. If he wanted to go to the meetings and volunteer to read in the classroom, I'd be thrilled. But it doesn't bother me that the ways he likes to help are different from mine. He has been the only dad in a room full of moms (at birthday parties or such) and he doesn't love it (he is kind of a man's man) but he puts up with it when he needs to because he loves his girls and wants to be as involved as he can (within his limits...)
There are so many different things that need to be done in a PTA/school. There is room for both of you to be involved. I hope he comes around a bit - maybe if you go to the first PTA meeting and scout out the scene? If there are dads at the first meeting, maybe he agrees to go to the second with you? Or do you know other parents from your child's class? Call other moms and see if you can round up a few dads to go so your dh is more comfortable? You didn't say specifically why he didn't want to. But if he is willing to chaperone field trips and help clean up after the back to school bbq and put together the new cabinets, I would try to back off on the meeting attendance a bit. Maybe he will come around after he gets involved in the ways that are easier for him first.