How many substitutions are there really going to be? There are only 3 reserves. If a team is carrying 2 extra pitchers, they only have 1 reserve to switch out on offense. Whereas, allowing 6 or 7 pitchers to get starts to get your magic 7 starts gives that team an upperhand over a team that only has 5 starters and 3 reserves. Typically, I'm not going to switch out my starting offensive players. But, I could have if I knew Sexson and Guillen were going to sit for a whole series or a predetermined postponement. And the argument to me is quite valid. Why allow pitching substitutions but not offensive substitutions? More than anything, clarify the rule.