There are only 300-400 active wingsuit base jumpers in the world. You cannot see or hear them until their parachutes open. Canopy rides typically last 20-30s or less. There are less than 2000 base jumpers total recorded in history. When I land in the park and walk out, I sometimes ask people if they have seen anything funny just to get an idea for what my exposure is. Everyone is oblivious to anything having happened.

edit: here is an example of how much base jumpers care about the environment and preserving it http://www.kmvt.com/news/latest/Perrine-Bridge-Canyon-Clean-... Chuma has been leading these clean ups for the past few years along with many other local jumpers.