but but but !
seriously? there are so many factors that influence an investment, even when one is being considerate, it's still a gamble. Remember that gambling is essentially a game of skill - you are trying to predict what will happen based on statistics. (i doubt if things like slot machines are even gambling and not just "entertainment")
.. bit of an extreme case, but look at the history of GoPro's IPO. A successful company selling a real product with much demand, investor panic absolutely destroyed the company, and the company being destroyed, through circular logic, proved the investors right. THEY HAD 1 1/2 BILLION IN REVENUE. Went from $80 to $6, that's 1/13th of the value.
Because you never get ... because you *rarely* get to invest in an environment where you're in control. Where you are not exposed to market insanity.
Also, let's not ignore that "wall street" - intended as a phantom abstract presence - is trying to normalize investing for casuals; through phone apps, through allowing microinvestments, by allowing "trading tips" TV and radio shows, and obviously the proverbial fool and his money will look for the investment of a lifetime. Meaning that they will be broek for the rest of their lifetime.