Film poster credits

Why do film posters all have the credits written in one style, with that tall thin font and the actor names one after another etc? They all seem to follow this pattern:

ABC STUDIOS AND ABC PICTURES PRESENT A SAMARM PRODUCTION A SAMARM FILM TOM CRUISE “MINORITY REPORT” COLIN FARRELL etc etc

Its difficult to describe, but I’m sure you are familiar with the style I’m talking about.

Is there a requirement to use this style? Or is it tradition? Or what?

I dont know about your questions, what I do know though is that Ive a Two Towers movie poster on the wall, and it doesnt have any credits on it at all…

So what’s the deal with movie poster fonts?