Ill put my 2cents: My main reasons for not wanting to participate with kids is that I have a quick temper, exspecially when it comes to disrespect and cheating. I tend to seek out the cheaters and hose them down, relentlessly.
Now, if I did this to your average cheatng little minor, like the one mentioned above, I would prolly get into a little trouble with mommy and daddy for sending their little rugrat home all bruised bloody from 50rps/400fps at that range.
To save all this headache its just easier for me and safer for you youngins for me to not attend functions that cater to minors.