when a service center changes freq. the transmitter is also electronicly verified to make sure the signal is correct and at the strength required for the unit to function properly, if its not, and the plane is out of range or poss. worse out of control thats where problems starts ie: crashing into the ground or worse into somone with the potental for a fatality.
when I purched my first ARF when the operator asked me( tower hobbies) what freq. did I want, my reply was whats the least popular freq.
so far at my club only one other member flys ch. 50 and he flys on sat.
usually sun is my day so there is no conflict but we also have a 15-20 min rule that says if your flying on a freq. and another club member shares that # then you have to surender the pin and place your transmitter in the impound until his/her time is up the rules are a guide and as long as the persons sharing the pin work out the time then the rule is very flexable until a pin hog trys to monopolize, then the rule book comes out and that ends any disagreement before it starts.