Interesting. I wrote a particularly tricky piece of code today. It required much more effort on my part than some simple code I wrote last week, so I need to be rewarded for that additional effort. Oh wait, I am rewarded with a salary for doing what I was hired to do - solve problems writing code.
What FogCreek is saying is that it should be the same thing in sales. You're hired to do sales. It doesn't matter if it's $10 or a million dollar deal, that's your job. Why should it be any different than any other salary person?
Another interesting thing to me is when sales people talk about all their great sales, but seem to forget that someone created the product they are selling. If thought about in that manner each sale should cause the entire company to get paid. In fact, that's exactly what pays the salaries of everyone who works there.