In my neck of the woods, we have a state park called Island lake (cement path and MTB trails) on one side of the freeway, and a metro park called Kensington (cement path only) on the other side. Riders in the metro park never stop and ask if you need help, which is typically because they don't know how to service their own bike, much less yours. Then on the state park 85% of riders (myself included), regardless of which type of bike they have stop and eagerly offer to help. A big reason for this is that the novices are scared of signs that indicate that state land can be hunted, and experienced riders are sick of accidents and near accidents with wreckless novices.