Well I don't mind revealing that I have "vanity" plates on two of my vehicles.

The big white van is: COYOTL, The Nahuatl word for coyote (canis latrans)

The big yellow Indian Chief (a motorcycle) is: 0 LULU which I say means: "Nothing to Lose" (zero two lu's), not a female name for the bike.

When the custom chopper (I'm currently building) is finished it's plate will say: NDN WAR since it is being identified as an Indian Warrior by graphics on the fuel tank, by nature of it's components, and (hopefully) performance. It also honors the spirit of Indian Motorcycle Company employees who are helping to bring their company (and jobs) back and those brave men who resisted the theft of their lands and the desecration of their culture.

It all started back in the 1960's when I saw a Rolls Royce over in Marin county (California) which plate read GREED.

Sure, it's ego tripping of the most blatant sort.

So what?

The positive side is; drivers of vanity plated vehicles daren't do naughty things while in their vehicles, they are far too easy to chase down.

I really can't see a negative side. You MUST plate your vehicle, regardless. If you can do so in some "creative" way; all the better.
BTW I would have asked for COYOTE but someone has had that plate since 1983.

CB