Yes this is why I see 3rd party maps as so much more important.
Not only is the budget for new maps apparently very high according to Stardock (I think Brad wrote somewhere), but also they really present a way for 3rd party maps to really make a name for themselves. With something like Supreme Commander ofcourse, hashing out a playable map is simple, and for a dev mapper, they can chuck a ton of maps out in relatively short time, and 3rd party maps are really diluted.
I am personally really craving some more 2/3 per team maps. I'd say the maps right now really serve 4/5 player teams much better overall.
I wonder if somebody could make a game mode that deactivates certain areas of the map on a rotation so that larger maps can serve smaller player numbers. Also I guess this could encourage larger maps to be built with the knowledge that they scale down well for smaller games. Hmmm, time for a new thread!