I still fail to comprehend how so many people sign up with such enthusiasm.
Really? I mean the HPSP isn't for me, but it's not hard to see why people sign up for it.
a) The majority of people making the decision are doing so before MS1.
That's long before they have (if they even will) stumble across SDN, let alone the Military Medicine forum under the Physician/Resident heading. Add onto this that those who do find SDN are assaulted by just any many voices telling them not to go into medicine at all. Grqanted that at least medicine has a sizeable number of proponents, but ultimately the SDNers in a position to accept HPSP have basically been conditioned to tune out the "nay-sayers" on SDN and label them (whether accurately or not) as "whiners".
b) It's a population of 22 year olds with college degrees facing another decade of no income and mounting debt.
As an MS1, I've yet to have a single day where the academic load made me question medical school. Realizing that I'm driving around on worn out break-pads because I can't bring myself to part with the $100 to get them replaced while people I graduated with are posting on facebook about their trip to pick up their new BMW is a pretty regular kick in the balls though.
You can talk about how in the long run you are worse off financially, but there is something to be said for being 22 and knowing you now have an income and health insurance. Even more attractive is the knowledge that at 26 you will have an income high enough to comfortably support a family on especially without loans to be concerned with. The point is, there is an emotional value to the extra money and lack of debt that isn't accounted for in a simple NPW analysis.
c) In the grand scheme of things, the worst case scenario is a 4 year period as a GMO which isn't that bad. To your pre-med just eager to be a physician and used to having no-income, four years of being a physician for decent money and getting to do a few "cool" military things isn't that bad of a scenario. Sure once you're there, that perspective changes because your baseline is now being a physician. The perceived difference between being a GMO and being a residency trained physician making civilian money is much greater from the GMO perspective than from the pre-med perspective.
d) All of this is often tempered by a personal desire to serve in the military.
In short, people take HPSP because they are willing to trade (either from ignorance or personal preferences) financial security in the present for financial gains and professional freedom in the future. It wasn't the right path for me, but I can see why it appeals to others. Financially and professionally it doesn't make sense. The same can be argued about medicine as a career, though. On a personal level, it probably makes a lot of sense to a lot of people...