GitHub's first employee owns more than 1% of the company, so I'm not sure why it's unrealistic. Maybe in the world of businesses letting VC's tell them how to run their company this is the norm, but it doesn't have to be.
National Instruments is an amazing company...I was fortunate to get to use their products on some projects as a teenager.
They IPO'd in 1995, btw.
In SAS's case they pay up to $70,000 as a bonus, in Canada anyway: http://www.eluta.ca/top-employer-sas-canada. Averages seem to range from $9000 to $32,000 (http://www.glassdoor.com/Bonuses/SAS-Institute-Bonuses-E3807...)