In my humble opinion I can't stand dance competitions ! , they belong in the 70's / 80's and as you previously stated are normally won by people who are " good dancers " but not the best in the room at that time as some folks will just turn their back on the thought of getting up to enter , even though they would probably win it !!!
Forget the russian gymnastic display , I mean good shufflers / spinners , who can make that 2mins 30 secs look like a work of art as they float across that floor ,
I've won a couple in my teens but usually had no intention of entering unless I was skint , ( normal routine ! ) , or saw a record I wanted that I could'nt afford and tried my luck to generate the extra cash , on both occassions there were mates in my crowd who would of danced me into the ground but it just was'nt they're thing to enter a dance competition .
Still don't understand why we have them , Blackpool one , being a prime example ,