Same thing happened to Draw Something and Words with Friends. The trick is to get the 9 figure valuation, raise as much funding as possible and then put as much in your pockets before the hype dies down.
I actually won once for something like $22, which was pretty good considering it felt like most of the time the winners got about $0.85 each.
Gotta be careful not to sell too much and be a canary in the coal mine to investors buying into the hype.
If done right you win either way.