Bitcoin - It's A Safe Bet
I have come to the conclusion that the chance of it going to zero is nil.
So, why invest only 5% of portfolio?
He says that
BTC will not go to zero but it could go to 5 USD

Trollypop (lambcrotch) sighting, can't believe you dignified that with a response. The point remains in a different fashion, if you're young and have working capabilities and smarts, you have a lifetime to recoup losses if it went bust. However, that likelihood is quite rare now so upping bitcoin as a percentage of your port could be safely quite higher. Thanks lamb, I'll keep this one off ignore for 24 hours.