I can't speak for today's competition pilots, but during the 1970's
the late, great Dick Johnson regularly instructed with our auto-tow
only club. During our summer months, Dick would instruct from around
10am till around 1pm, then jump into his HP-13, Skylark 4, Nimbus 2,
ASW-17, or even a club 1-26. We'd give Dick his auto-tow, and Dick
would fly off, returning just before sunset to help put the ships
away.

During this period, Dick won 2 US National Championships, and
represented the US in 4 consecutive World Championships, placing in
the top 10 in each.

At least one example of a competitive pilot also instructing.

Bob

On Mon, 1 Mar 2010 14:48:17 -0800 (PST), glider
wrote:

Just for fun, I wonder how many CFI-G types have Gold Badges with
Diamonds? How many instructors compete?
I would think that an active instructor is not the same chap that
goes for long flights or gets involved with competition. I'll bet it
takes a different mind-set to want to instruct.
GA
(CFI-G, seldom)