Just peeking in from the NCAC where a few years ago the ten-team conference went to two five-team divisions. Now, the only conference games that count towards getting into the playoffs (top two from each division get in) are the in-division games, and we play four of them against each of the other four schools. Back to back doubleheaders, Saturday and Sunday!
So, you need four starters for those games, weakening yourself tremendously for the mid-week contests. The team that I follow, Wooster, generally plays about two mid-week games, and pitches by committee. Usually the following weekends starters will work a couple of innings during the week; Saturday's scheduled starters pitching about two each on the prior Tuesday or Wednesday, Sunday's on Wednesday or Thursday. Pretty hectic, and luckily Wooster has been very deep pitching-wise the last few years.