Oh, my FA geared city isn't only active during FA's. This particular little casual, absolutely no minimum requirements FS needs all the help it can get so it gets played a few times a week, every week, with my primary there being touched up two or three times a day. So far it hasn't been an issue because it hasn't even reached tourney status yet, but when it does (and then spire), I'll be puzzling over how to maintain it's ability to remain FA focused, while also being able to at least help a little with tourney and spire. I'm sure it won't be very effective at tourney or spire, but, again, any little bit extra helps there and my main there is very good at both tourney and spire.
I feel like between the two cities I have a greater chance of helping this casual FS.
PS. At the risk of repeating myself - when 8 to 10 casuals (because not everyone in the FS even plays the FA) are excited to participate, but can't finish one path on the third map, it sucks. And while I realize everyone here is hard core (my main is, too, which is how my main city is in a top FS with Magic Pagan and Genefer), keeping part time casual players playing helps the game overall. More active cities = better.