What do you want to know? How do you do it? What and How gives you the answers!
There is an argument that microstock photography sites (photobanks / agencies if you like) source these ‘cheap images‘ from an army of ‘citizen photographers‘, unprofessional/non photographers who do not know the value of their work.
While this in part might be true in that some sites are cashing in on photographers who currently have no other means of selling their images, the whole industry has opened the door to a new career in microstock photography for many people.
It has allowed countless professionals and amateurs photographers to earn money from images that they would otherwise earn nothing but enjoyment from. The high standard of the pictures available on microstock photography sites speaks for itself.