Actually, the rate ran up to the point that Mt. Gox could no longer bear. Unfortunately, it's rather easy to start an exchange and get people using it (or at least, it's no more difficult than any other startup) so there will probably always be companies willing to manipulate the market for personal gain. And since every popular exchange's price affects every other, manipulation from one will manipulate the price at all the rest.
The modern day bitcoin trader should carefully consider whether they want to be a part of a market where the largest actors aren't bound by the rules they set for everyone else.
The modern day bitcoin trader should carefully consider whether they want to be a part of a market where the largest actors aren't bound by the rules they set for everyone else.