You may not watch for the dancing, but a good number of people do, and that is why they get tired of sub-par dancers being in the top 6, 5, 4 spots, when a much better dancer, but less famous goes home. I watch to see which star gets better from week one to the final week. My favorite star doesn't always make it very far, because quite truthfully, they can't dance and they don't deserve to keep going, other times they got the shaft because a sub-par dancer with a pro fav was kept. But I still watch, because I can appreciate the fact, that there are other stars, that I don't really like, but can dance and I enjoy watching the dances.
And for the 2nd bolded part, ya and it is an actual show. It's called So You Think You Can Dance. It features - trained and untrained, but highly skilled dancers, non pro dancers or semi pro dancers - competing to be the best DANCER of that season competition and whatever the Prize is that that show gives to it's winner. Once again, it's based on their dancing ability, not their singing ability - they don't sing on the show do they. It's not based on weither or not they have stared in a TV show or movie that we (the general public) like. It's not based on the number of season they played a sport or the sport they played. No....it's based on the skills of their DANCING. PERIOD.
DWTS is nothing different, it's a DANCING show. The only difference in the format of DWTS, is instead of being a vertual unknow, it features "Stars" that at least one person watching the show has heard of before. The shows format doesn't require the "Star" to sing, or draw, or stand there and just look pretty. It requries them to dance. Ballroom dance to be specific.