Conceptually it is easy to understand, but it is how you apply it that ultimately will give you the benefit. Finding the average in a price will allow you to begin to see if an equity is overvalue or undervalued, trading at a premium or discount. Simply, if the price is above the average, you may want to look into seeing if the stock is overvalued because you do not want to be stuck paying too much for the stock.
Another way to apply the averages is trend identifying. If you see that the midpoint continues to decrease, two things could be questioned such as if the company fundamentally sound or is the stock just trading on lack of exposure. Midpoints are a wonderful way to begin your analysis and research of a company because it gives you a reasonable starting point to begin identifying certain factors. There are millions of ways to use midpoints and it varies greatly. The best way is to jump in and begin seeing if it can tie into your existing setup or analysis procedures.