Rule #1: Invest only what you can afford to lose.
Rule #2: Never forget about rule number 1 (cuz if you start losing and dont remind yourself about rule #1, you will get into depression real fast and it will kill you inside out)
Rule number one looks like some self excuse to shave the sheeps for that much as they can afford. Contravener perspective applied here.
By a rule of thumb there are several red flags waving around any scammy ICO. Whitepaper of course, count buzzwords. General approach of the afford. People involved, where are their faces and how do they appeal to you?
Many small signs.