It's important to interact with your members, and make them feel welcome in your community so that's exactly what I do. The more your members like you, the more they'll want to help your forum succeed.
I might say hi to people I run into a lot, I'm friendly and I'll usually know if they are too. Since we're in the same places and forums we're likely alike in some ways and so it's actually a good way to meet people with related interests.
Remember when you were two years old and anyone in the sandbox was automatically a friend? Parents might sit nearby trying to mind their own business but the kids would be best friends for life within minutes? I wish it was that easy as an adult, lol.
I happen to know that Bauss is an avid poker player for example, HI BAUSS!
And yes, I definitely try to be friendly and participate. Whether it's on my site or on other people's sites, I see no reason to completely distance myself from others. I would rather connect. Who knows where I might meet an amazing person that I spend the next 10 years talking to because they're so awesome?