Interesting enough, i stumbled upon a good video talking about the same subject. Here is what i wrote about it, If anyone interested (https://steemit.com/cryptocurrencies/@phgnomo/lets-talk-about-pump-and-cumps)

Pump and dump groups os Just like piramid schemes... The last ones that arrive are the ones who get f****.

Dont do It. There is a good reason this kind of thing is a crime on traditional markets.