So to all you "Investors" that keep claiming 5 BTC is low, why aren't you snapping up all these shares?
At the risk of being cheeky, they aren't snapping up the shares because they dumped them all at 4.7-4.9 yesterday.
I disagree with your statement that share price won't drop to 4.5 once it passes 5; all I can see are those "hold, spartans!" memes on /r/Bitcoin when BTC/USD was $200+.
I should also mention that I'm not trying to antagonize people by being pessimistic. The "sky's the limit" crowd is a mixture of (a) genuinely optimistic investors, and (b) people trying to keep the price high while they cash out. Devil's advocates are necessary in times like these 
Care to take a guess as to the (a):(b) ratio?