To the OP: you probably need to define what you mean by "pros," as it looks like this is about to turn into another "what is a pro photographer?" thread. Do you mean someone that gets paid to take photographs or are you talking about stuff for major ads, magazines, etc.?
Sorry to start a war here...
The experience I have with people taking my photos (the friend of a friend situation) are girls who have websites, charge for their work, and usually also work at a stock photography company or do other design work. And not to sound sexist or anything, but these girls usually has a husband who is bringing home the bulk of the family money - they kind of do this "on the side". I would consider these people "semi-pro".
However, when I ask what a "pro" would do, I'm asking about the guy/gal whose work is quality enough to show up on a major magazine, get hired to shoot supermodels, etc...
Don't get me wrong, I not thinking I'm ever going to be one of these people. My question was really just to make sure that I wasn't going to buy all this lighting equipment and find out that nobody uses that kind of stuff outdoors. Like I said, my home is my "studio", and my indoor options are limited by that. But it's pretty apparent from all of your responses that I will definitely be utilizing my lighting equipment outdoors.