Forum:Are Entertainers really worth it?

Okay, so in all RollerCoaster Tycoon games, you can hire Entertainers. But do they really do anything? in the instruction manual of the original RollerCoaster Tycoon, it says that Entertainers increase guests tolerence for long lines, but when I tried it, it didn't notice any less people leaving my lines. So, what do entertainers do that's helpful?