When you want to show everyone that you can't afford an actual private plate that spells something.
I suppose it also gives everyone that sees it has the chance to discuss how your number plate will fail an MOT and that you will get stopped by the Police for being a bell end.
At least these people are a life lesson to children - demonstrating what happens if you don't try hard enough at school and get such a poor paying job that saps all of your manhood to the point where you think buying "J77 ONC" for your Kia will make everyone think you are awesome...
Lol who buys an Economist over a V8? There's only a few grand difference. ššš