Comet has had the SG shows as the backbone of their lineup for years; for their first year or two, they ran two hours of SG1 back to back to back every night (yeah, their prime time schedule was two hours of SG1 followed by a repeat of those two hours). Then they added Atlantis, and they eventually started swapping them out, running SG1 for a few months then running Atlantis in its place. I think they even added SGU to the rotation. B5 started a few years ago, not long after they started airing Andromeda.Comet had it the last several years replaced by SG1.
Their programming lineup has gotten a bit more diverse recently. At least they stopped doing that "we're going to run consecutive episodes of the same show all day long!" thing that they were doing. It's hard to keep up with a show when you miss eight shows out of ten.
FYI, Comet has an app on the AppleTV (the hardware box, not the service) where you can watch their live programming. The benefit to that is they don't run the ads during the commercial breaks, except for the house ads. They used to run some ads during the breaks, which was actually worse than watching it over the air, as they were 10-15 second ads that were looped, so you'd see the same ad repeated over and over and over during each break.