I have found that many companies over time have used diff fonts in their print because they really didn't give a crap. They tell us that is their logo and we try to duplicate it because we assume it is important. Also, if the logo is very old, the original makers just wanted something similar back when... but now they are gone and some new person takes over and wants to do it like it was written in stone and doesn't realize that the people before him didn't really give a crap!