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Yeah, but they have a lot of money to spend and they buy expensive high performance hardware.
Notice that Nvidia provides Linux binary drivers of the highest quality, equal to their Windows drivers. It'd be interesting to compare their sales of Quadro GPUs with Linux use. I bet that the correlation is quite high.
Sure, but the question is, if Linux should become everyones darling OS at all. Look what happens with MacOSX right now, more and more professionals are leaving the plattform.