Edit: You were before me, so added my comment as a reply to you instead.
(Source: dropbox.com/about)
It's not just file storage for five bucks a month.
In business, usually it's possible to achieve whatever revenue you want; the hard part is getting there without a headcount/other expense basis that makes you bleed money instead of earning it.
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"In 1973, he attended college prep and engineering classes at Lawrence Technological University and graduated from Detroit Country Day School, a private college preparatory school in Beverly Hills, Michigan, with a perfect score of 800 on the mathematical section of the SAT... In 1977, he graduated magna cum laude from Harvard University with an A.B. in applied mathematics and economics... He scored highly in the prestigious William Lowell Putnam Mathematical Competition, an exam sponsored by the Mathematical Association of America, scoring higher than Bill Gates."
I'm not sure if he coded, but Ballmer definitely has a mathematical/technical background. I'm not sure technical background is necessarily an indicator of success as an executive.