Why are there so many SORRY busses?

In Vancouver we have a lot of busses. They are typically stuffed with people and are a very useful, if crowded, way to get around the city. But why is the most prominent feature of these busses the SORRY message that shows when the bus is not in service?

When a bus is in service the number and name of the route is displayed on the electronic sign on the top of the front window. This is always done in mixed upper and lower case letters, so it's not an obtrusive sign - just a very useful one.

Sometimes when there is a sports game on, like a hockey game, the sign occasionally flashes Go Team Go. The message goes back to the number and name of the route fairly quickly, so the cheer does not interrupt or confuse potential riders that much.

Typing anything in all capital letters is considered rude. It's called "shouting" at your readers. It's almost as bad as using all lower case letters and actually expecting people to go through the pain of trying to read what you didn't put enough effort into writing to properly capitalize. Life is too short to bother with text written in all lower case and too stressful already without having text shout at you.

So the busses that are not in service shout the fact out. You can't miss these shouting busses, even if you weren't waiting for one. And if you were waiting for one, it's rather disheartening to be passed by so many screaming SORRY ones! It's nice to know when a bus is not in service, but do they have to be so noisy about it?