I looked through your post history and skimmed the threads you created in the pre-med forums. Only ONE person mentioned anything about dentistry, and they said the following, "Dude just go back to school and be a dentist,it would be your best option from the ones you've presented us with. You've got some serious work to do on your GPA though...it seems like too much trouble to go through in my opinion though if you haven't any real passion for it...idk none of these careers look like they are going to happen for you and I certainly think you don't belong in healthcare if its strictly a monetary interest"
Of course there are people that get jobs only for the financial gains, but ANYONE will tell you that you shouldn't do something (anything) just for the money because you will certainly like your job a lot less (maybe even hate it). Becoming a medical doctor shouldn't be something you do just for the money. As you already know, you go through a hellish 7-8 years of school/residency. Unless you match into a competitive specialty, you'll be working less than desirable hours. From a financial perspective, becoming a dentist is ALSO something you shouldn't do for the money because dental school is expensive. With your stats, your highest chance of getting into dental school is a private school, and they carry price tags of around $400,000. You looking to go $400,000 in the hole just to do something you really don't want to do?
As for your "$150,000' remark, yes, that is generally true for dentists working as associates (may be slightly less for a recent dental school grad), but as you continue to work in the business your salary will increase. If you have the desire to open up your own practice, sky's the limit as to how much you can make.
Sorry, I can't provide an answer to your post-bacc programs question. You'll have to do some searching at your state's university/ies to see what their requirements are, or any school you're interested in. Maybe someone else that has done a post-bacc on this forum can help you. As a last resort, you can definitely go to a community college to do some post-bacc work.
Honestly though, if you're looking for an easy route to dentistry, you aren't going to find it. Even if you manage to get your GPA up to above a 3.0, your stats are still below average (inclined to say the average is around 3.4-3.5). In order to impress adcoms, you'd have to seriously ace all the post-bacc classes you take. In addition, you'd have to retake all the prerequisite classes you got below a C in during undergrad. All this work could definitely take you 2+ years. So if you think more than 2 years of work isn't going to be financially "worth it" because you'd only be making 50K more than someone with a masters/PA, then you really shouldn't pursue dentistry.