Kim Kardashian went blonde, and, well, it was pretty disastrous. When your only trademark aside from the size of your pooper is dark hair, going platinum is going to be a tough sell.
That said, everyone says blondes have more fun, and based on the hair color fails you're about to witness, that's pretty effin' debatable. Not every person was made to have blonde hair. That's why a lot of us, you know, weren't born with blonde hair.