Your accountant is a magician if your 95k a year gross is netting you 72k. You're just thinking income tax, right? I wasn't. You can't live life in Canada avoiding all the other taxes and still function.
Anyways, even if we just look at income taxes and ignore all the other obligatory taxes we all pay just to live, putting someone in the top 7.5% of wage earners is not reasonable. Why do I say this? Because the income is not earned in the same manner as the income of an SP, you know what I mean? So can it be deemed a reasonable expectation that is spawned from what one is "accustomed to"? Did you know that the top 10% of wage earners account for 80% of the income? Being in the top 7.5% is being within that top 10%.
As for "business" costs, please do tell us what the business cost of an independant SP are that would change the figure significantly? I'd say the revenue to costs ratio are about 98%. 2% cost is not significant enough to call it cost in the "business" sense of the word.
As for money buying happiness, and not much happiness being bought above 75k/year household income, that I think largely depends on how hard it was to earn the additional income. If it is extremely taxing, then why would someone want the added stress. On the other hand, if it's a pretty easy or passive income, then why the hell not have more money. Having more money is not something people get unhappy over.
Now of course I'm not planning on proposing to C.Parker, but all I've been ranting about is this common thing I've found when it comes to the vagaries of the statement used by such, "what I'm accustomed to", when brought into the harsh light of SP economics in the real world.