That was a good video @dougpolkcrypto... And you are absolutely right in your observations.
People watching the top 5 cryptos to invest in 2018 on youtube would just follow these youtubers, buy these cryptos, frantic buying will increase the value of these cryptos thereby increasing value of the stake held by those who are promoting them via youtube.
One should do their own research and make a prudent purchase, and that's the way to go...