I understand that the typical trend is 70% research and 30% physician work.
The "goal" according to most program directors is the 80/20 or 90/10 research/clinical split. What percentage of MD/PhDs actually end up doing this is unknown. My guess is far less than half, and so this is not typical. However, this is what is expected of you and these are the people you will meet, so this is what you should think about and say.
What are the most common physician careers-- is it internal medicine?
http://www.dpo.uab.edu/~paik/match.html
Yes. It is indeed internal medicine.
Is a physician's practice and research correlated-- if a physician is a cardiologist, is his research in cardiology also? In terms of the research aspect, most MD/PhDs have grad students and technicians do the research, while they write the grants and oversee the daily lab procedures and comment on the next stages of experimentation. Is it possible to do bench research also? Do the MD/PhD have to own their own lab? Can't they team up with someone who already possesses a PhD and aid them with their research and be a co-author?
You can imagine anything you want and also do anything you want. Nobody is going to stop you. The goal according to the program directors is to produce independent investigators who bring their own grants and run the show.
I am assuming that most of the money that a MD/PhD earns comes from their physician salary and very little from their PhD salary, since they would rather re-invest it into their research. Now from your response it appears that MD/PhDs work 7 days a week. Am I correct? So in all essence MD/PhDs have others do the bench research, while they secure the money for keeping their lab open.
The money a MD/PhD earns comes from a combination of grants and what clinical work they do. As pointed out your money is not "reinvested". You negotiate a salary with a department that you attempt to support through your grants, and if not the department usually picks up from other funds. However, you can expect to earn less money in most specialties by doing mostly research as opposed to mostly clinical practice. You can also expect to work harder, have less job security, and have less locational flexibility.
On a side-note, I have heard that few MDs want to do research. And those who do, if they work in a research hospital, are gladly encouraged to do so and welcomed with open arms. Why is that?
Residents and fellows are always encouraged to do lots of research because the attendings and departments that do research need low paid and highly skilled workers. If you are good enough to bring in large grants, this is a source of money and prestige, so everyone will want you, but this is not common. Otherwise, this "welcomed" statement I consider a pretty big stretch.
Think of it like this. If you are an independent investigator with such good ideas and experience that you can bring in large ($1Million+) grants, OF COURSE programs will want you. You basically come in and give them the money you worked so hard for in exchange for the space for you to work. The problem with this ideal is that these grants are extremely competitive and the funding rates are currently only funding the top 10%. So sure, if you are the best everyone will want you. If you are not the best, good luck.
In any case, unless you are the best it always seems like a battle. Yes you're given some time for research, but there's always clinical duties that interfere more than you were promised. Your research not going well? Ok, do more clinical now... I've heard some departments like hiring MDs and MD/PhDs for this reason--nobody to fire. You just force them back into the clinical world if their grants don't pick up.
And those MDs who do want to do it, do they do the bench research for the PhD and given the same amount of credit if a novel discovery is made?
An MD can be trained to do research work and be as successful and independent as a PhD.
I guess the factor of respect and prestige are taken into account because MD/PhD is more prestigious and well respected than just an MD.
I have no idea what you're getting at here. I wouldn't say that very often if I were you. Myself, I'm getting a little annoyed at the number of snide comments I get both from MDs AND PhDs (moreso from the PhDs).
In a sense, doesn't it seem easier to be an MD doing research than an MD/PhD because you save time getting the degree, but at the same getting the degree in an MD/PhD program is only 3-4 yrs. So more or less it evens out, I guess.
That's the trick. You have to get this research training somewhere. So if you are an MD-only you will need to invest several years of time getting trained and then doing research anyways. The big difference is that the MD/PhD forces you to get the training up front while the MD never forces and gives you the flexibility to do it when you want.
I wanna be that guy