Lol....I'll just say... really high. BUT.... I'm not a dumb *** either. I fly next to (And I mean next to!! See my post of the Q i lost a couple of weeks ago.) mountain terrain and there is no plane or anything to hit unless it's crashing. 
Just a couple of things to think about... Our Q's are not the kind of drone you would ever want to fly over a crowd or event. Our Q's (like many others) are the ones you see falling out of the sky and hopefully just missing someone.There not like the drones you see flying over the NFL football games.
Some of the members here are working to get their FAA commercial drone licenses for business.
If your serious about the business side, have look for those threads and make some new friends.
Let us know what we can do to help.

Added: here's one of those threads
I passed too! Another FAA certificate on the way!

Just a couple of things to think about... Our Q's are not the kind of drone you would ever want to fly over a crowd or event. Our Q's (like many others) are the ones you see falling out of the sky and hopefully just missing someone.There not like the drones you see flying over the NFL football games.
Some of the members here are working to get their FAA commercial drone licenses for business.
If your serious about the business side, have look for those threads and make some new friends.
Let us know what we can do to help.

Added: here's one of those threads
I passed too! Another FAA certificate on the way!