Love the way you call me "Mactard" - if ever proof were needed that personal abuse is the last resort of those with no coherent or valid argument, then you Sir, personify that proof.
When, in the early 1980's, IBM introduced their desktop machine - with the Chaplin advertising campaign, IBM's System 36 mini-computer was one of the most widely found small & medium business computers. Very few companies had any form of IT professional, and it was (too) often the bean-counter - or very occasionally, someone with a nascent interest in early hobby machines who became the specifier.
It was virtually axiomatic in those days that "no-one ever got fired for buying IBM", the IBM PC became ubiquitous, first as an executive toy/status symbol.
Other systems with an O/S from Digital Research, or Convergent Technology, inter alia, slowly died the death of a thousand cuts.
IBM thought they had DOS (bought in from Gates - who'd bought it in from elsewhere) exclusively but as history shows, they were wrong - and with the immediate advent of cheap (and sometimes very nasty) IBM "compatibles", the presence of DOS machines began to trickle down to the hoi-polloi.
With their ever-increasing presence, early developers concentrated their efforts on what was the largest market for simple economic reasons which should be apparent to even you.
The subsequent omnipresence of PCs is based in the 1980's mini/mainframe wars and has absolutely nothing to do with the relative merits or demerits of any particular platform. I would also remind you that greater numbers do not necessarily denote superiority - cockroaches outnumber humans by many thousands or even millions to 1.
Apple were never "out-competed" by Microsoft who never offered hardware:- It was the old adage quoted earlier, plus cheaper offerings from Compaq, Toshiba and many others who offered cheap machines.
That, and Gates' willingness to license DOS to any manufacturer/assembler is what gave rise to the PC dominance which was continued up to the present day by Microsoft's (alleged) dirty and illegal business practices, and their (alleged) theft of software from others, if they thought it could be valuable.
As someone who lived through those times as a software engineer for Burroughs, I do have an inkling of what I'm talking about - and yes, I have upgraded the Graphics card in a cube - which I agree was overpriced. But the cube was discontinued in July 2001 - over seven years ago!
I have found that the G3, G4, G5 and now MacPro towers are unbeatable for working upon, but if you really wish to continue with your "I'm so clever that I can use cheap generic" boasts, please remember that very few BMW, Lexus or Jaguar owners have been converted by owners of the admittedly much cheaper Yugo cars.