Can anyone tell me why Beeg.com are so big??
 

Straight forward and simple.. why are beeg doing so well?
The website is so boring and ugly, no porn star pages on there and really not much to look at.

yet they get around 5,000,000 visitors a day

is it because they are so plain and simple? and no one really cares about looking at porn star pages or looking at videos from a specific channel? is that the answer?

Please let me know your thoughts :)

Yes! That's the answer: It's so fucking plain and simple! :)
I have to say that I like this approach a lot.

simplicity, clean, fast + shitloads of stolen quality content

They have a really good content, that is why.