My friends and I (who are R/C aeroplane flyers) have discussed the possibility of airsoft UAVs.
We've concluded 2 things: 1) You WILL have some jackass shoot at it, regardless of rules, and
2) cost vs. practicality/usability. Always seems to be weighted too far in the cost side to really be usable.
"Someone in a Prius tried to race me at a stop sign the other day. I couldn't believe it. I had him for the first 100 feet or so but I can only walk so fast."