Ah, the classic "Holier than thou" attitude of some technical people. 375 million pageviews a month, between ads and merchandise sales I'd be really surprised if they make anything less than 7 figures a month in revenue. Hate the company if you wish, but investing in them is far from an indicator of a bubble, in my opinion.
So why is anyone investing in them? That would only strengthen the bubble observation, with people just desperately throwing money at anything that has ever achieved any success (or simulates something that once had success).
"NOW WITH MORE LOL CATS!"
"THE MILLION DOLLAR HOMEPAGE IS NOW OFFERING FRANCHISES!"