The rules don't prohibit it, I'm not sure winning this show guarantees a professional career, but it certainly enables the dancer to live a little more comfortably while trying to do so. (And I'm sure it looks great on their resume...as it does for most of the top 20). Additionally, it's not like all that many dancers make big names for themselves other than within the dance world. (like oh-so-many of our b'way stars)
Benji Schwimmer had won a number of national (and I believed professional) dance competitions. (And as much as I like HIM, I really didn't care for his sister, Lacey, at all. I didn't like her on Dancing with the Stars, either.)
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.