Yes, but limo costs do add up - any decent one is going to cost at least $100/hour. If you're going out all the time, it can easily run up tabs of thousands of dollars per week.
That may not seem much to someone really rich, but that same person might also be paying $4,000 per month for the $200,000 Bentley in the garage. No one is going to pay that much for a car and not drive it. Cars are status symbols and celebrities want to be seen in them.