Yep. It is great, till it isn't!
I remember when Intel's top bin desktop chip was priced around $1k
generation after generation. It wasn't 0.1% of sales to crazy gamers
either, businesses were buying quite a few top end systems - they
were still dirt cheap compared to VAXen and AS/400.
Intel adapted as the market evolved, lowering costs to keep gross margin
just as high if not a tad better than the good 'ol days. You can do that
when you control your destiny - less expensive packaging, design for
yield, repair and salvage, tighter integration of design methodology and
process design etc.
I wonder how Apple would do in a world of $200 iPhones? Can they just
tell Foxconn to start making them for one third the cost? :-D