@Kevin - let me take a representative quote from Matt's 2-hour interview in the special WPWeekly episode back in December:

http://www.wpsnippets.com/2008/12/transcript-of-wordpress-weeklys-interview-with-matt-mullenweg-december-2008-part-1/#content

JC: Ok, so here’s the next question: Why is it that so many people within the inner circle of the WordPress community believe you and Automattic don’t want anyone else profiting through or around WordPress? It seems to be this notion, primarily from those who make a living selling premium themes.

Matt: *laughs* Well, I have said it before that it’s hard to convince anyone that the way that they currently making money is wrong, *laughs* you know, if you are paying your bills with the way you’re making money, you’re going to find ways to rationalise and… sort of believe in that.

Be sure to read through all three parts. Some of Matt's opinions on the matter don't become clear until having read all of his responses.