I always notice a lot more people getting off at Forest Hill station than the preceding stations (both commuters and late night Overground).

It could be that Forest Hill station has a larger catchment area than the surrounding stations; or the catchment area is similar, but the demographic of the local population is more similar to me, so I travel at the Forest Hill 'peak times'. I can also imaging more scenarios; however, it would be good if anyone would share the actual reason.