Rubberduck - our PTA (or rather, Parent Council, as it is called now following changes in legislation in Scotland) is like that too.
We try and keep it very informal, with people able to help as and when they are able.
Dh is Chair - but essentially the other parents do most of theo wrok as "porjects" for whtver they are interested in.
It's not just aobut fund raising - it also about helping the school achieve the best for its children and what we as parents can do to help (which was part of backround to the new legislation here in Scotland). So for example we, in conjunction with the school, have produced an "A to Z" of things you need to know for the parents of thechildren starting P1 in August. often the teachers don't realise that the parents don't know certain things.
We also had to respond to a consultation for our Council on changing the provision of English as an Addtional language support - which would/will have an impact on all the children in the school, not just those that are not English speakers.
DH and I are both parents who "see the bigger pitcure" and realsie that the work that we put in is for the sake of our own child and the other kids in the school.
However, we may well be burnt out by the time that ds gets to secondary school and make the decision not to get so heavily involved (dh is also Chair of the management Committee that runs the Out of School Care). However, somehow I doubt it.
We do complain abut the level of commitment - I owrk full time, dh is studying and trying to set up a business and somethmes these commitments get in the way of the time that we could be spedning with our own ds. However, I hope that he will learn by example and see that sometines it is worth doing things for the greater good - and develp the same sense of "collective" responsibility.
BTW - I don't think our Parent Council os cliquish: neither dh nor I have ever "done" the school gate (ds goes to breakfast club in the morning - at his request) and to Out of School Care in the evening. There is a range of parents involved - and teachers too. Some come more regualry to meetings than others, but that just depends on cmmitments - and we usually get plenty of volunteers to help at the couple of events that are run.
The only time that representatives use clipboards is wehn we are doing a blitz on the abusers of the zig zags outside the school and taking the numbers of those cars that persist in stopping there. (There are two brave mums who are perapred to do this)