CarRental.com is always going to be preferable to El-CheapoCarRentalinAlabamaDownby-theCrockRiver.biz
If you cannot see that there really is no hope for you :p
Of course any company in the world is entitled to go looking for their own domain name and good luck to them if they find one either by auction or dropping, but do they really have hours or weeks to spend searching like full timers do?
It is a case of spending $10 on a domain, $50 on a years hosting and lots of manhours building out your website and having it all come to naught if no one can find you, or paying $1000 for a good quality domain that will give you a great chance and retain its value if you ever want to sell.
When I pass a town on my way to work of a morning I come by a printing shop with the domain, printing.co.uk that actually invested well because it has 400+ buses full of passengers pass by it a day as well as over 30,000 cars and 40,000 walkers, that tells me everything I want to know and I remember it, and so does everyone else passing by on the bus on in cars and on foot.
$1000 for so much free advertisement??! The guy who owns the shop is a genius.