In my country (North/Eastern Europe) you pay more (€500-€2000) for a license plate that has certain combinations of numbers such as 123 or 747. I've noticed that pretty much every Porsche has a plate like that. It's kind of silly, because people who have no clue that exists won't care at all. You can also go full on custom plates, the funniest I saw recently was someone who had H0DL... on a Toyota RAV4 :D I guess the plate cost 20% the price of the car.
I used to live in a Middle Eastern country where the plates were simply Latin numbers, combinations didn't matter, but if you wanted a shorter plate you had to pay more. If you had a 1 or 2 character plate (which is at least $500k) supposedly girls would just leave their phone numbers on your car, regardless of what car you had.