This isn't really the result of a deliberate strategy (most of the time). In this case, there are no sellers, i.e. the stock at the moment is worth more to a potential seller than is currently being offered by the market. That means the price must rise to entice the potential sellers to part with their stocks.
Suppose you had bought a stock and you think it's a great company, easily worth $10. As long as you continue to think it's worth $10 you're probably not going to sell it for less than that, even if the market price is below that. However, if the market went some way above that, say $15 or $20 then you'd be likely to sell your $10 stock and bank the profit.