According to this chart, those with higher education do earn more per week on average than those with less education; Invalid Link Removed
Those with professional degrees earn slightly more than those with doctorates, which is probably confounded by law degrees being included in the professional degree category. I assume we'll see a greater discrepancy between the earnings of those holding doctorates and professional degrees as more universities staff their classrooms with adjuncts and create less tenure-track faculty positions, since a great deal of the respondents in the doctorate category most likely work in the higher-education sector.
What the chart doesn't describe, though, is how educational breakdown is for those who are the most wealthy in the country. We're talking about a different population when it comes to those statistics. My educated guess is the majority of the "1%" probably hold MBAs or law degrees. The others hold medical degrees or some may have four-year engineering degrees who found their way into executive level positions at Fortune 500 companies. I'm not sure where those statistics are or if they've ever been collected and analyzed.
Dude, if your educated opinion is that earning a Doctorate of Medicine automatically puts you into the 1% of income then I suggest you do some fact based research instead of guessing. In my profession, guessing and educated opinions get people killed.