I imagine that it is because people are constructing a schedule filled with names of teams it would be cool to play and beat, as opposed to strictly strategy-driven scheduling. What puzzles me more is when people schedule SIM's as home games when the could play the same team on the road on a near-neutral court with more reward for the win. I suppose if you need your home court advantage to beat the SIM, then that is an explanation, but I see teams with no home court advantage playing SIM's at home.