the problem with such topic is that 99% of the time when someone is saying coin X is awesome, buy buy buy, it means that it has already been pumped to the max and the one saying it is the one those sell walls are created by.
That's right - or they haven't created the sell walls yet.
People vaunt what they've already bought. "I'm all in, join me!" From a trading standpoint, "I'm all in, join me!" means: "I don't have any more money, so I need you to throw in yours to push the price up!"
So...when everyone pumps a coin, "everyone" is not going to be pushing up the price themselves because they've already bought. Which leaves the question: when "everyone" is tapped out, who's left to buy??