I was thinking about this in relation to Girl Guides. I've no experience there but a long-time leader was saying on another thread that she simply couldn't get any mothers to volunteer to train as leaders, or even to help out on trips etc. Hence the need to accept men as volunteers in what used to be a single-sex organisation, but even then there are just not enough volunteers to meet demand from parents, so there are long waiting lists and units closing because a leader leaves and can't be replaced.
I don't imagine this is unusual. I've always had reservations about volunteers doing a substantial amount of work for nothing. It creates problems with requiring them to train and keep up to date, with saying no to people who aren't suitable, with firing those who behave badly or are incompetent, and there are plenty of ignorant and selfish people about who don't grasp that volunteers are there out of goodwill and treat them badly (as they probably would paid staff, but at least the paid staff have the salary and some employment rights).
My own volunteer experience was mostly a long time ago when my children were little and then at primary school. I was a SAHM and I helped out with NCT, a local toddler group, PTA things, reading in school and (biggest commitment) as a school governor. Even then, 20+ years ago, it was a huge struggle to get anyone to volunteer. Not surprising, as most other parents were juggling work, running the home and childcare, and some had other caring responsibilities as well.
It must be a lot worse now, with most families routinely having both parents working. Retirement ages have gone up, so the pool of healthy, active older people looking for worthwhile ways to fill their time must be declining, and a lot of them will be helping with childcare or caring for older relatives anyway.
Is it a model that's had its day?