"I am not sure that more serious* companies...I mean with actual paying customers and such."
Cheezburger has been a profitable business since inception. We have been profitable every single quarter, and never had a quarter with negative cash flows. Our revenues and profits are in the millions.
Very, very few startups can make that claim.
We operate three different lines of business: we sell advertising, we sell merchandise (at http://lolmart.com) and we publish printed materials such as books and greeting cards (http://amzn.to/buztLM).
I assure you that having fun and LOL is a serious business.
Scott