Some people do not look around them , not like you,as a gardener. They just go to school, drop off, and go straight to their next thing ( like working at a desk/shop/ caring for others), they are more likely to pay attention to something in front of them. Were you involved in the school garden by chance? Some people dont read well, or research everything and work on suggestions, especially those put right in front of them, plus the children will see them and have nagging rights. The school clubs are also for the benefits of children at the school, whilst wine bar and chippies less so. I think you should approach said school about a children's gardening club, and stealthily change their tasteless ads by having far superior tasteful ones.