I see a lot of the 12 and 14ch radios at IMAC and 3-D events then at the IMAA events, IMAA is giant scale and like Joe mentioned, big scale planes can use up a rado really fast. One of the pilots I know was showing me his 14 at the local IMAC and it was just way more then I would ever use. Then again I used to say that about the 9 and 10ch radios and I can use up my 9 in a hurry with one of my big planes. I have been told that some of the heli pilots are using the big radios a lot but I haven't been to an event so don't know.
Not something a weekend pilot would need.