Media Week reports that FX is on pace to make $936 million in advertising this year, up 10% over last year. If you add in carriage fees it receives from MSOs, that gets FX to nearly $1.4 billion in annual revenue.*
Before you go asking questions like is Kurt Sutter being paid enough or whether FX will renewdespite it's low ratings, keep in mind FX has been on a buying spree buying up movie TV rights for titles like The Social Network, Wall Street: Money Never Sleeps. Grown Ups, Karate Kid, Iron Man 2, Shrek Forever After, How To Train Your Dragon and The Twilight Saga: Eclipse.
*I used the SNL Kagan estimate of $.38/mo/subscriber at the end of 2009 and Nielsen's coverage estimate for FX for the carriage fee calculation. I did not take into account that FX is currently not available to Dish Network's ~14 million subscribers due to difficult carriage fee negotiations.