Gavin and Evoorhees are trying to please everyone by attempting to put everyone's thoughts on cruise control, while almost everyone else is either hitting on the accelerator or slamming on the brakes. Gavin said, "Only invest time or money into Bitcoin that you can afford to lose", and also "When will #bitcoin speculators start chasing another squirrel?" I think when it comes to speculation Gavin and Evoorhees should stay quite quiet and keep to themselves. They are just attempting to be guy that tries to be always politically correct so when shit hits the fan they are in a position to say, "I told you so." However, they have nothing to lose when the price goes up. Why are people not angry at Gavin for telling people to only invest their money they are willing to lose at $35-$40? Now, bitcoin is nearing $200? I should have bought more bitcoins!
It's a basic equation of risk vs. reward.
In poker and other forms of gambling it's known as EV calculations (expected value).
Say you make a double or nothing bet of $100 with 60% chance of winning. EV is then (60% * 200) + (40% * 0) - $100 or $20, meaning that every time you place that bet you win $20 on average if you make this bet many times. It is however pointless and untrue to claim that if you do this just once and win to claim that you found a system with 100% ROI.
You have to look forward to properly evaluate risk and reward. You can't look back and say "I could have gotten 400% return on my money the last few weeks" because you ignore the risk that you took upon you at the start.
So why don't people take their life savings and bet on sports when the strongest team is playing one of the weak ones with 90% chance of winning ? Because the unexpected can always happen.
Saying you should only invest what you can afford to lose is just sound general advice. And it's something we've seen many times in the past. Bubbles are stronger the more ignorant people are about general financial risk. Around 2000 many internet stocks gained 20 to 50 times its initial value, many stocks easily went from $2 to $100 within months. And the same thing happened, many heated discussions from fanatics that insulted and ridiculed anyone talking about the chance of a crash, who could only see one thing: if I put all my life savings into this thing I'll get rich. In general, once you feel you have to rush and get in today or else you fear missing out on a great opportunity, it'll usually end in tears.