It doesn't help, and let me explain why:
1) Malpractice insurance is heavily specialty-dependant.
2) Malpractice insurance is heavily location-dependant, and very affected by state laws.
3) The structure of malpractice insurance varies based on the type of practice you run. You are making it sound like physicians simply pay their premiums out of their own pocket, but that is only true if you set up a solo practice. However, if you join an established group, the liability is spread out over the entire group. Depending on your circumstances, the group may even foot your portion of the premiums for a period of time as a "sign-on" bonus. If you join an HMO, depending on whether they self-insure or not, you may not have to pay any premiums directly.
Put malpractice insurance out of your mind, if you are a pre-med. I'm about to start residency, and have only a vague notion of how these things are done. It is not an appropriate concern to have at a premed level, because things are constantly changing, and you have no idea where, what, and how you will be practicing in 10-15 years when you finally get out there.