I built an application to solve a problem but got nobody to buy it

I have built a Windows Desktop Application to solve a problem, the problem of creating Identity cards of a large number of students/staffs. The creation of ID card is generally done with photoshop and separately edited for each card, arranged in a sheet of 10 cards. I automated this whole procedure. I showed this application to people who make ID cards in manual way and have suffered a lot in past. They want the application but not interested to buy. Why do people want everything for free when other have put a lot of effort on making it?