If evernote doubles it revenue every year for the next four years, it would still be trading at 3 times revenue, a number that might be realistic going concern

If evernote doubles it revenue every year for the next four years, it would still be trading at 3 times revenue, a number that might be realistic going concern assuming they have very high profit margins. So valuing them at 50x revenue now is saying all returns will come from outperforming 100% annual growth... color me sceptical.