And I can think of a million other factors besides just "who can pay".
Men vs. Women might not care who their doctor is as much, and may not place a premium on who makes them "comfortable".
What's wrong, Rx-me, thanks, bye!... etc. And as such might be more likely to go with the "first available doc" etc.
It might be second-order economic "privilege" at work. More likely to have a car, or more likely to live and work where the medical center/Dr.'s office is.
Could be cultural... Rosario's impressions of "going to the doctor" are when in the "old country" they had to sell the family goat to pay when Pepito got appendicitis..
Because believe me, if it were merely based on "who can pay" being the chief indicator of who was getting less/no service... we wouldn't be in this damn mess in the first place.