stherling,
Agree with your comments. There are other factors (besides interest and 'want to help')that I am sure are factors for many's decisions to go into the field, factors that applicants are not being frank about (no choice): job security, high income possibility, respect, prestige ... Provided that many don't do a lot of things that are just around them and can thus help people immediately, why would these same people go through many years of hard work, debts, stress on family relations... and then coming back to help others? Two good questions that are very good to verify there are such motivations are:
'do you donate blood?' If one truly wants to help, and if there's no medical/religion reason, then EVERY person that says 'I want to help' really should be a donor. (I am one)
'what is the threshold of yearly income, below which you would not consider medicine?'