I use priceline all the time, but I think that CC can still probably get me a better deal. After his fee though, it works out to about the same. However, I have been bidding on hotels for years, so I know a bit about what I am doing. He is still better at it then me even with my knowledge and if I was booking outside of Toronto, I would use him hands down as I won't know the area as well as he would. He books for everywhere.
Yes, Hotels ask for ID, but that is not the purpose of CC. It is not a system to completely hide who you are. Also, he has a way of avoiding statement items on your personal CC if you wanted those to be kept private. While a few hotels still require credit card deposits, most will still accept cash so it makes hobbying a little more discreet. You may have to show your DL at check-in but you would have to do that no matter what. Personally I say use your Passport for ID, it is perfectly legal and does not carry your address on it, so no major info can be retained by the hotel. Use CC for booking with his 3V system and you have a hotel that only knows your name and nothing else. No real address or credit card info.
The one advantage to using CC, you don't have to do the bidding on priceline yourself. CC has a huge knowledge base and give you an idea of the hotel he can get you. He also has deals with others hotels, so you don't even need to do a priceline style booking.
If you know hotwire, priceline and the ways to bid and auction for lower hotel rates, then great but a lot of people don't have the time, knowledge or energy and CC makes sure they still get a deal. I think his fees are $10-$15 per booking, so while you pay up front, it is for a 10 bookings or something. He offers more customer service then you get with priceline that is for sure. There are plenty of advantages to using CC and he has plenty of clients who love his service.