The number thing is abusable. Witness facebook still operating under the SEC's 500-person limit:
http://dealbook.nytimes.com/2011/01/03/facebook-and-the-500-...
I'm not aware of any measurement method that any moderately smart rules lawyer (aka anyone who's played more than 5 hours of a strategy video game or pen and paper RPG) couldn't figure out a way around.