Depends on what you define as own? I have 2 for my business that I pay for and use, but then I have a bunch more that are technically my customers, but I usually will register and pay for the first year of the domain when people sign up to host with me. That will change soon though as I am setting up an autopilot system where you can register using your Credit Card and the system sets everything up for you, then you will need to register your own domain name.
Ok, I added my 2 cents, I am done.