please don't pursue a PhD just to get into medical school
it's just such a waste all around
MD/PhD should just be for people who want research to be a signficant part of your career
as far as I know, most schools treat those spots like they're precious and are quite adept at looking at an app to see if it supports a commitment to research
if your app doesn't show that, it's a waste of adcom time and your and money for you to apply MD/PhD
that said, people want that MD so bad they'll often say or do anything I guess