I think that's true to an extent. And, especially successful people, often would rather be their own boss for less money than to be a corporate cog. Having the freedom to make ethical judgements yourself and build local community is a real luxury. We are, mostly, just social animals that want to build our status by helping each other out in the end.
Two things, I think, might make the decision for them, in spite of that:
- The money is actually more than their business could be projected to make alone. This is because the PE firm isn't just buying the single practice but every practice in the area to kill competition. Get that captive market and you can charge more.
- The personal ownership freedom can be already lost on these independent people if they feel they are already tied down too much. I know this is especially the case in small medical offices where insurance and regulation can over-rule them. Feeling like you don't have control in this way can cause a lot of depression (tangent but look up how we condition mice in order to test treatments of antidepressants on them). At that point, the monied exit starts looking like a better option.
That's how cynicism can win out. And we all lose.