The reason why Jefferson, Temple, Drexel, GW and Georgetown are perennially on the ‘most applicants’ list is because all these schools are private (i.e. open to everyone), have relative modest admitted student stats and are in popular major cities. WesternCOM gets tons of applications because----California. LECOM has 3 campuses (2 in PA an 1 in FL, but all applicants apply thru the main PA campus) and over 4100 students.
The number of applicants applying to “top” schools isn’t as high because of self-selection. Most applicants know they don’t have the nosebleed stats or the exceptional achievements needed to be competitive for those schools–so they don’t bother applying. The median MCAT at WashU, Yale and NYU for 2017-18 was 423 (99th percentile).