Where there are rules they will be either broken or modified, human nature to do so.
Give me an RPT A/C inbound to a CTAF any day, at least they are more professional at their R/T procedures than others. Some pvt pilots are very switched on without a doubt, you can tell instantly you first hear them either inbound or upon taxiing, sadly a lot make it up they go despite being 'licensed' pilots.
CW