I think these pumps are a scam not normal because usually who ever planning to pump certain coin will buy those coins at a higher price and then ask people buy them so that he can sell at higher price. But whoever buys at a higher price will lose their money because those coins never go back to that high price unless someone else again plans for the pump.
i think maybe yes, you can say like that because some coin after its pump, the price is back to bottom price again. but we know that some people is making big profit with this pump and if the price is down, they can buy at low price. i think its too risky if we are follow with this pump because we don't know when the pump is over and we are only for another pump.