A better comparison might be getting into HBS vs. getting accepted to YCombinator. Even for that, I'd pick YCombinator, but at least it's an even match.
* Think twice <http://www.economist.com/whichmba/think-twice>;
* Actually, 40 Years Of Data Show The MBA Effectively Does Nothing -- It Has No Impact <http://www.businessinsider.com/the-mba-effectively-does-noth...;
* "If the MBA was wiped off the face of the earth, we'd live in a better world." - Tom Peters (MBA, Ph.D, Stanford) <http://post.ly/1CRCf>; From <http://garr.posterous.com/if-the-mba-was-wiped-off-the-face-...;
If you consider the meta aspect of it, say, why are you even learning marketing at HBS, then I'd come back to startups, but it might be different for another person.
If you're a shithead business type with shallow friends and a twin-Volvo outlook on life, then maybe the church that is HBS may provide you with the kind of social cred and justification that a spineless social-climber seeks, then being accepted there, or any other Ivy-league B-school program, may give you the unwarranted hard-on you seek.
However, if you get off on eating peanut-butter sandwiches for weeks straight in a shared apartment in the Mission, while you write and rewrite code as you contemplate the benefits of listing suicide attempts on your CV under the heading "Recent Experience", then maybe bootstrapping a startup is something you should consider if your medical team has no objections.
Again, undergrads are a dime a dozen, B-school schmucks are mainly followers of a established social paradigm and entrepreneurs are a collection of nuts, burnouts and unregimented losers who'll package their mother in a two-fer if it brought in more business.
My argument was that Stanford and HBS acceptance in a lot of cases indicates a good test score, whereas selling a company shows you can execute... you've actually DONE something.
I've met too many MBA's ("idea guys") who can't execute, or at best they can create 10% more value working from a base of hundreds of millions. But in general, I haven't seen too many create value from nothing. So that's what's different about exiting a bootstrapped venture.