That's kind of convoluted advice. If no one buys, the price will never go up. The problem is that the people that do buy usually post that they are sitting on the bid or below with their offers to buy. That just pulls the price downward. Of course, as soon as they fill, they want the price to go up, but there is always someone behind them, trying to fill even lower.
Sellers are not always the problem. Often it's the buyers.