ALL my 300 2.8 pictures are hand-held. I use my tripod for other things. But not for interrupting my speed of use with my supertelephoto lens! Yes, it hurt at first. No, I'm not going to be using a tripod... (yes, I do have a good tripod!)
But all that said, in about 10 years, I am going to drop the 7 or 8 or 9 or whatever thousand for the Mark II. I already have the Mark I, and am sure it will last that long and longer. The 300 2.8 Mark I is great, frankly, a lens beyond my comprehension for goodness!
That being said, I'm wondering what the OP's point is - perhaps, the 300 2.8 should be cheaper? And who are these mysteriously wealthy lawyers, doctors, and engineers he knows? Could he introduce them to me?

Maybe they could get me a 1DX for Christmas, with a 600 f4 kit lens!
Anyway, I don't mind Canon charging a hoard for gear; they have to make money too... I wish it were cheaper, but I also wish I had a free Bacon dispenser in my living room...
If the OP wants to boycott Canon, he may feel free to, though I don't think it will do much to them... As for the professional photographers, I think this forum is kind of loaded with them and their little brothers, the semi-pros (slave by day, artist by night...)... I myself being a part-time money maker, I do feel that remark to be rather inconsiderate...