I haven't seen that at all. That said, most of my leagues these days are LIVE leagues and there are 2 factors that would tend to make LIVE leagues tend more towards the RL tendency of all teams playing reasonably even in 1-run games:
1) LIVE owners tend to spend a larger percentage of their budgets on elite RP. Even if you know it's not technically the best way to build a team, it's pretty heartbreaking giving up a lead in the late innings because you didn't draft enough high-caliber short relievers. Close games are therefore more likely to stay close and not turn into runaways.
2) More importantly, in LIVE games the owner that's 1 or 2 runs behind will frequently use his best relievers if he thinks his offense has any chance of coming back. This is closer to the way things tend to be done in real life, where every manager plays to win every game at all times.