Probably tees the staff off to be expected to predict what games their random customers will want to watch on a nightly basis too. If you want them to put on the Nats game, just ask nicely when you get there.
Saturdays in particular are tough this time of year. Sports bars make their money off of football season. NFL will pack them in, but you get maybe 2-3 seatings, at predictable intervals. Colleges, you have games starting from noon to 11 PM, with assorted alumni groups. There's usually a few tvs available if you have 50+ at a place, but you'd be surprised how much scheduling is involved. I'm at the point where I do not go to CCSP if I want to watch baseball on a Sunday or Saturday in September or October.
The whole sports bar concept I think is on the ropes. With streaming and all the cable packages, you really don't need to watch a game at a bar. If you want to watch multiple games, that's a bit more reasonable, but I think the concept is past prime.