Well that is true if you are buying fresh not registered domain. Of course you will register something that make sense.
My comment was on already registered domains that are out for sale.
If someone is offering me montrealfacials.com without any traffic on for 500$ and xwuysh.com with decent traffic for the same price I would still go for other one. Probably register montreal-facials.com
and make it as second entrance to already working web site !