My point, albeit missing in the humour, is that if you rang up a temp agency and asked 100 secretaries to come down and sit at 100 Linux desktops and be productive for a day, you wouldn't get any return on your investment.
Do the same task with Windows, and you'd be mostly successful. It's all in the ease-of-use and familiarity, not in the security and command-line speed.
That's one reason why Macs are gaining in popularity again (which previously waned because nobody wrote decent software for them).....and yes I am perfectly aware of OSX's underlying architecture.