Maybe we just have different ideas of what a "close base" is then.

I consider the A19-A1 flight on the longer side of flight time. If the fight is taking place is the middle of the two base between the radar rings then I consider that a good short flight to a good fight, but that rarely seems to happen. It's usually one side hording the others base until everyone dies or runs out of ammo. Then the side that was being horded chases everyone back to their base, hordes there until everyone is dead or out of ammo, and rinse and repeat.
I think more bases gives you more options for a fight. Currently on SFMA for example, the only fight you ever see is from A19-A1. I've rarely seen people going from A8-A25, and I think I've only ever seen people going from A16-A31 twice in all my years playing this game. I think that's mostly to the fact that those bases are further apart than A19-A1. Plus, there's nothing after A31 but empty space, and once you get A25, it's still a longer flight to the next bases than A19-A1. So I'm guessing people log on, see the usual hording going on at A19-A1, say "No I don't want to be a part of that. Let's find another fight.", don't see anything going on between the other bases, and log off. I've tried the "start a fight then!" tactic of flying to the enemy base and trying to stir something up, but 9 out of 10 times I just circle the base for 10 minutes with manned guns shooting at me.
Perhaps we have different views on what a good map is based on our different play styles. I'm a dogfighter and I like maps like Greebo's crater where I can find a fairly short flight to a fight anywhere on the map. You being a high altitude bomber kind of guy probably see maps differently.