I started buying prints about 10 years ago. I buy them for my office walls and I look at them every day. The first rule for me is that I have to love the photograph. While I buy them for the office, every once in a while my wife will lay claim to one for our house. One of my favorite prints is by Ryuijie. My wife confiscated it for our living room.
I knew I had accumulated a number of prints, but I just counted the ones on the wall and I have 19 hanging right now. I have at least that many in boxes. I rotate the prints every 6 month or so. I have several Sextons, a couple each from MAS and Paula, Ryuijie, Kim Weston, William Blunt, Witherhill (pre-digital), M. Bayer, Fagen, Nze etc.
I find that the prints inspire me. And, I always compare my work to the prints to see if I am meeting the technical standards of photographers I admire. I have a rail hanging on the wall surrounded by photographs. I will put my photographs on the rail to live with them for a while before final matting. I find it beneficial to see my prints in the context of hanging with prints by photographers I admire.
Lately, I have been buying prints from lesser known photographers.
I used to buy a lot of photography books. But, I calculated how much I was spending on books and figured that I could buy prints instead. Three to four books equals one print. I enjoy the prints more than book reproductions and it helps the photographer who is starting out.