Currently I've got a few offers, but they were not my first choices. Today I got a letter saying I'm waitlisted from one of my top choices for marketing PhD. Do marketing PhD programs fill its vacancy with waitlisted applicants a lot? I'm not sure whether I should just accept the offers I've got, or wait it out until March or April 15th. If getting an offer as a waitlisted applicant is low, I'd rather just take the offers I got and move on.