Intresting topic,
There are many reasons why one should use ARO, most are within reason and probably would hurt in doing so. I take into account where I live. I am up in the High desert of Nv. where air is thin and the humidity is very low. Most things don't seem to rust or corrode as fast as they would in a much higher Humidity climate. Helps me to decide how often to use ARO. If I run evry week, I won't ARO my motors after every run, maybe every other run. At the end of the season I do, more for winter storage. Seems to work so far.