We do know that this market is really that unpredictable, i do agree into those points been said that manipulation is something that evident or pretty obvious. Market could dump out on -10% or even -20% in a flash
on which it is neither been caused by some FUD or really just totally having no reason at all.
This is why on the time that those flash dumps happen then tons of people would be shaken off and making those panic selling into their current positions which it do leads into that
buy high sell low thing and this is where it would be resulting into negative and when it comes worst then they have that blown out trading account or investment.
Be realistic and be wary on how this market behaves or moves so that you wont really be getting shocked on the time you do encounter it.
If you can endure years and years, even decade long these crazy movements without selling or losing all your money, and just hold long term then you could make the most amount of money you could make from any investment ever. I personally believe that it is not going to be all that easy, but if we could make it work, then we should be feeling fine about it.