I agree that it's not a major factor that they consider. However, again...why bother applying to any schools you don't actually see yourself at?
In addition, I was shadowing at a SVOSH clinic in Mexico that IU's optometry school had (because I was living abroad and it worked out conveniently). I chatted a lot with their admissions chair and he mentioned that they are getting more and more applicants who are only taking the OAT once and doing well the first time, plus they aren't applying to a million schools. He said they look at those students first. So while applying to lots won't usually be make or break for your admission, it could mean something if they are deciding between you and another applicant (especially in the case of waitlists). If this person is applying by September, s/he will have some answers by October and will still be in a position to be an early applicant to plenty of other schools. So I think it's wise for money and looking as great as possible to your first choice schools to limit your applications at first. No big deal if you decide to cast a wider net later, but there's really no need to do it so early. Like I said, I applied to five even though I had a very clear top 3. I wish I had waited to see what happened with the top 3 before throwing money at the other schools (one of which I traveled to to interview at). Even getting into 1 of the 3 would have showed me it was unnecessary to apply to any others.