If it is a not for profit society, then there is a requirement to have an AGM (annual meeting) where the budget is voted upon. I would call up the chair of the board to ask. One way to know that it is a not for profit society is if they issue charitable tax receipts for pure donations during fundraising time. The not for profit fundraising money, at the very least, needs to have a budget that is available for all members to review.
Alternatively, this could be a privately run preschool, where the owner / teacher reduces costs by having parents commit to performing some of the duties. In this case, fund raising should be specifically and clearly tied to a purchase or else people will refuse to donate without a tax receipt, because the money could just go to pay the owner / teacher salary and profits.
A Comparison:
Currently, parent participation preschools here charge $110 per month for two half-days per week, plus annual expectation of $200 fundraising, $75 for registration fee at start of year. These run with one early childhood educator teacher per class and 2-3 volunteers (which combines clean up and in-class volunteer time). The "drop and shop" e.g., no parent volunteers required during classtime, only for after-school volunteer roles, program is 3 afternoons per week for $195 per month, same fundraising and setup fees. Classes are 3 hours long.
Minimum wage is $11 per hour, the ECE trained, experienced teacher/owner would be making at least $25 per hour. (Reference point, incase you are in a very LCOL area).