You seem too focused on the exact scenario of applying to graduate schools, when the OP's comment wasn't circumscribed to that, and my comment certainly was muc

You seem too focused on the exact scenario of applying to graduate schools, when the OP's comment wasn't circumscribed to that, and my comment certainly was much more generic than that. People's choice of poor quality service provider X impacts their ability to do their tasks when the service is poor. X can be email, insurance, banking, anything you externalize in your life. The fact that a service is popular is a poor indication of service quality, if there is a correlation at all. Examples abound for popular services and products that are poor quality. Usually, the best services are a bit up, from the popular choice point, in the price/quality ratio. More so if there are free (as in beer) offerings in the market.