Bitcoin is not a get rich quick! It's a "get rich slow" or "get poor quick", and you need to select one about now 
True, but it is not really a "get rich slow" scheme. I would not call 6 months very slow.
Maybe more of a "Get rich with a small bit of patience" is a better way to put it. I think I read somewhere that in the history of Bitcoin, no one has lost money that has bought and held longer then 6 months. Sounds pretty good when you think about it that way.
Looking at the chart, you are correct. That is actually very impressive when you think about it.
The best strategy, it seems, is to buy bitcoins and then unplug the internet for 6 months and wait