Why do some colleges require all testing to be reported?

From one of the schools we’re looking at:

“It is [college]s’ longstanding admissions policy to use a student’s highest score for each section of the SAT (Critical Reasoning, Math and Writing) regardless of the test date. Accordingly, [college] asks applicants to submit all SAT testing from all test dates. The university will continue to use the highest combination of SAT section score (from one or multiple test dates) in rendering each admission decision…Because our database already selects the highest sectional score for inclusion in the application file, “score choice” for [college] is redundant.”

I object if the school states that it will only consider highest scores, but insists on the applicant sending them all. If a school is engaging in some of the activities mentioned up-thread (penalizing applicants who take multiple tests) then they are not, in fact, looking only at the highest scores, and should be transparent about it.