Picture SF doing a real superset.
Gym 1 - Hammer machine incline press
Jumps in car for 3 min. ride
Gym 2 - Cybex chest press (Tells attendant "be right back brah").

Jumps back in car for 3 min. ride
(End of set one - repeat 3 more times)

But yes, wife and I both belong to two gyms each. She and my girls go to P.F. twice a week.
I go to Crunch (near my work twice a week (great little gym for the $$).
And then we both go to WoW Gym 2 times a week. (3 gyms, 4 memberships, at 10.00 a month each, its still cheaper than the local gym we were going to for 2 memberships (one each).