What premed program in the country has an 80% acceptance rate? With only 40% of applicants matriculating in a given year, you’re ruling out every undergraduate institution in the country, including the ivies, MIT, and Stanford. I get that you’re talking about postbac programs but honestly this position is indefensible. There are very few programs that have that level of success, Goucher and Bryan Mawr come to mind, but they accept fewer than 60 students between them with GPAs of 3.7+ and high standardized test scores. Basically, they are selecting from among students that are predisposed to have a high likelihood of success regardless of the program they attend. They do this to maintain their high rates of matriculation and to justify very high program costs. I’m not saying it isn’t worth it if you have the resources but to paint this as the only reasonable option is misguided.
Also I don’t understand your point about post bac programs being unregulated. Undergraduate institutions reviewed by regional accreditation bodies. There is not a special board that oversees post bac programs as the underlying programs are already reviewed and receive accreditation attesting the programs ability to meet minimum requirements.