"The PWYW scheme did a good job in helping us gather invaluable data on our customers, but may not be sustainable over a long run. This is due in part to the fa

"The PWYW scheme did a good job in helping us gather invaluable data on our customers, but may not be sustainable over a long run. This is due in part to the fact that although we ask people to be Fair, not everyone is." When fair is defined as "pay what you want", how do you define unfair?