Of course! I realize I'm going to sound a little bit like Leona Helmsley or a raging one percenter here, but $300,000, much less $175,000, isn't that much money. It'll support a decently comfortable lifestyle, but by no means an extravagant one. It is, however, much more than the nation's average net compensation, which was $42,498 in 2012. True wealth almost never comes from income, it comes from equity. Income is ephemeral and is designed to be largely spent, not accumulated.
As for the time and effort put in, that is a big part of why most highly compensated professionals are highly compensated, because the firm/company/practice owns your time. It will never compute on an hourly basis, because there are not enough hours in the day, but I do not know a single person in a lucrative career who does not take work home, go in on weekends, sacrifice their personal life, etc., and while many lower-compensating professions do that as well, particularly teachers, social workers, clergy, etc., that is a part of the job for all of us who chose those careers and nobody should be surprised to find out that their chosen career requires a lot of long days.