Prime Time for Sins is: 3:00 pm - 10:00 pm U.S. Eastern Standard Time. At least that's how I see it.
The player counts really have decreased and it is becoming harderd and harder to find games. A before Diplomacy and after Diplomacy comparisson is profound. Before Diplomacy was released, it wasn't all that difficult to find 5v5s. After Diplomacy split the community it became very difficult and player counts are down. Also, for various reasons, many of the pros left the game and moved on to greener pastures. Many of the people online now are newer players. I've actually been seeing a lot of them on regular Sins. The other thing that makes it hard to find games is that most of the games are private, friends-only comp stomps.
Every online multiplayer game's player counts are going to whither away and die at some point, so it should come as no surprise that this seems to be happening to Sins. The only real surprise is that we were able to enjoy playing Sins online for as long as we did. When a game only has 280 people online, max, just two or three months after its release, back in April and May 2008, as Sins did, the writing is already on the wall.
There are still games to be had, but they are fewer and further between. You might not be able to find a game with all of the settings you want, and you might have to play with new players. I guess I don't mind playing a 3v3 with all new players where I get to be the hero and carry the team to victory if my allies can just hold out.
The loss of the pros creates a great opportunity for people who are tiring of playing against the AI to come online and try their game play against other newer players. Another thing that might help would be if regular Sins or Trinity went on sale or would get bundled with a video card. Should Trinity sell for $40 into perpetuity? Might it be possible to earn greater profits by selling more copies of the game at a lower price point?