I have zero PTA experience so I can't comment on how they handle membership dues.
PTOs are all different. It's up to each parent group to decide for themselves.
I've been in three PTOs. Two of them had no membership fees. All parents/guardians of enrolled students were automatically members. One PTO charged dues. Any parent could volunteer but only paid members could vote and run for office.
Some people come into our lives and quickly go. Some stay for awhile and leave footprints on our hearts. And we are never, ever the same."
"The ultimate aim of karate lies not in victory or defeat but in the true perfection of one's character."