Why do some of us collect old computers ?

< Why do some of us want to collect these old computers. ?? As an engineer I like to study old computers as there were often some good ideas or neat tricks encapsulated in them. To have machines off the track I followed (intel/z80 or DEC). This leads me to to aquire Kim-1s, Trackstar128s and the like. To have and use machines I didn't own but worked with. Like PDP-8s, Vaxen SDK85s, sdk88s and others. To extend, modify or otherwise use the systems I did aquire over they years. I may be unique as many of the oldest machines I have are orginal purchases. I have and use machines I could not afford in their time. Systems like the Compupro, Visual 1050, PS2/50z are examples of this. All of my systems are operational, many are used daily or weekly. Allison