Softball and baseball probably both cost about the same with similar expenses for travelling, scholarships, and equipment. The problem is people probably don't buy softball tickets and softball games are rarely televised.
The tennis team has 11 athletes. Let's pretend 8 are on scholarship. That's probably $120,000 a year. They have 15 away competitions this year. You're probably sending 10 people to those if you include coach(es) and a team manager. All food costs, tutoring costs, anything athletes get is probably divided by the total # athletes and that's added on to the expense for that sport.