This isn't exactly an accurate question. MLB starting pitchers are generally suspended for 5 games at a minimum, which is intended to mimic being suspended for a start. While it doesn't exactly mean a start is missed, it does affect the team - you need 5 other starters for those 5 games, likely meaning you are starting someone who wouldn't normally start, or someone from AAA, or you're starting someone on short rest.
This is most easily seen in the default suspensions for actions a pitcher would likely take. In recent years (more recent than the question, following the latest CBA largely) starting pitchers are actually given 6 games commonly, which will often reduce their total start count for the season.
In the case of things like brawls, starting pitchers get similar levels to position players, except they usually start at 5 games. That's reasonable, because it's a similar proportion of the season for them (2/32 instead of 10/162, both are effectively 1/16). Ian Kennedy for example received 10 games, or effectively 2 starts, for his role in starting the Dbacks-Dodgers brawl in 2013; only one other player received even 5 games.