On one level you are right, but on another you're missing the fact that there is more ways to profit than simply hoping value goes up. In fact, you could put yourself in a position to profit from a bubble burst as well if you use some imagination.
Oh no doubt. There was some fantastic profit to be made during the 2008 market crash (to use a more recent example). I'm just trying to caution the "newbies" that this game has played out before and a lot of people have been burned.
Bubbles are part of history, dating back to the great tulip bubble and probably even further. It's like leverage, you can use it to your advantage to exponentially increase your profits but at the same time it can be like a sledgehammer to your head. People just need to be wary.