Transponders and Radios - USA

While I would like to have a transponder installed,
I don't have two necessary items:
1. Money
2. Panel Space

My panel isn't overly large and doesn't have room for
a B-50 (two holes) AND room for a 'back-up' variometer.
So, when I 'splurge' for another instrument, it will
be for a B-50 and not a transponder. The B-50 will
have to occupy the holes currently filled by a B-40
and a PZL mechanical vario.

So, without a transponder, I keep the ATC Arrival/Departure
folks apprised to my where-abouts by calling in on
the radio and telling them. They respond, 'Glider
N124, Squak 42xx (or whatever) and remain clear of
the Class C Airspace.' I tell them I don't have a
transponder and they politely acknowledge. If they
have time, they might look for me with the primary
radar. I keep the radio tuned to their frequency when
I'm flying near the Class C around Raleigh-Durham Intl
Airport and just listen to traffic.

Do other pilots monitor the local ATC facility, or
do they keep the radio's tuned to 123.3?

I prefer to listen to the aircraft talking to ATC than
to other glider pilots when there will be more GA and
commercial aircraft in the area than gliders. It helps
me keep up with the traffic situation.

I don't do this on every flight, just the rare ones
that take me close to the Class C airspace.

And, the next time I plan on attempting the Diamond
Goal flight which takes me completely around the Class
C airspace, not only will I tune to the ATC frequency,
I'll call them on the telephone before I launch just
to let them know about my intentions.

I'm just wondering if anyone else monitors ATC when
near congested airspace?

Thanks,

Ray Lovinggood
Carrboro, North Carolina, USA
LS-1d, 'W8'