Commercial Rating for Towing Gliders not needed? in US

Some of the recent contests I've attended in the US had trouble
getting tow pilots and enough towplanes. One issue was the
controversial issue of do towpilots need commercial ratings to tow at
a contest.

I did just read an article that I wanted to share. I'm a bit behind on
my reading but the Feb 2010 issue of AOPA Pilot had a relevant
article. Page 42, Pilot Counsel, by John S. Yodice, AOPA general
counsel. "Complex private priviledges".
It discusses FAR 61.113.
"...the general part of the rule, a private pilot may not act as pilot
in command of an aircraft that is carrying passengers or property for
compensation or hire"...

The six exceptions to the rule are 1) a flight incidental to a
business or employment; 2) a shared expense flight; 3) a charitable
flight; 4) search and location operations; 5) sales demonstration; and
6) glider and ultralight towing.


So does that last bit mean we can have contest towpilots using their
private ticket?
I don't know how this issues was resolved otherwise but thought this
exception might have been overlooked by some contest organizers.

Also I don't know what the insurance companies require.

Chris