Because they dont train for it!
Bad flexibility will limit your dancing ability. Flexibility just requires consistency, make it a part of your weekly training and you can get your splits in a few months. All other professional dancers are flexible, why cant all the bboys be also? Here is how I trained for my splits.
Notice that all the really good powerheads have their splits? Watch these guys with their splits do perfect powermoves.
(c) Breakdancing Ninja – Read entire story here.