Also, why do we want to keep seeing the same actors over and over in different roles? Yes, we like good actors for their abilities and feel that it's more likely a project will be good if they're involved, but it also kind of ruins the suspension of disbelief seeing the same people over and over. Shouldn't we want to see new people whom we don't have any preconceived notions about? Or do we just like that certain recognizable people can "trick" us (for lack of a better term) into making us believe they're a different character?
I guess some of these things are just human nature, wanting to like and be liked based on shared experiences and such. Lately, I've been thinking about lot about why we do things, our motivations, and basically how everything we do is driven by our animal impulses. Wanting to be liked and going along with trends is herd mentality - in nature, animals are safer as part of a group. Even things like why we like shiny things - Christmas-type lights, a shiny car, etc - and found that, while no one knows for sure, the prevailing opinion is that we're attracted to shiny things because of shiny things in nature that humans need, like water. Or, a brightly colored, shiny piece of fruit - I assume the bright color and shine are usually denoting ripeness.