We like to punch people, some people like to spend hours pushing little buttons with there thumbs, these guys like to build things out of lego. Who's to say which is the "weird" group
Personally I wouldn't dismiss it folks with "nothing to do and a lot of time to do it with."
A colleague of mine has won awards for his Lego castles...he typically uses about $30,000 worth of Lego for each one. He's also a hard-working and brilliant engineer as well as a devoted husband and father of three.