Actually that is a very valid question and one I am happy to answer. Actually there are several reasons why. Frist was the price i paid for it $350.00 well below what most are being sold for today. Espically on Ebay. Second was I had played with one before, it belonged to a teacher of mine, when I was takeing a course in electronic music in High School. Also I have always been fascinated with synthesziers simmlar to the Moog espically the old modular moogs, like the one Wendy Carlos used for recording Switched on Bach. Plus I have wanted to own a modular moog synth, but figured this would be cheaper to own. Thrid, the simplicity of the Minimoog intriquied me quite a bit. Just a few knobs and switches some basic waveforms, no presets, no memories no cursed menues to weed through. Plus the number of digital synths that I have gone through that never seem to satisfy my needs. Of course a lot of digital synthesizers are complicated. I mean 10,000 sounds in a Korg Triton I mean really how many people use even half of them? (okay I may be exagerateing about 10,000 sounds, just trying to make a point).
As I stated eralier it is the simplicity of the Minimoog that really got me hooked to wanting too own one. That's the same reason I own an ARP AXXE and OMNI simple synths. How many of today's newere and more current gear are as simple and basic to use as the Minimoog. You show me one good digital synthesziers that is simple and easy to use like the Minimoog and I will buy it.
By the way you can get a lot of different sounds out of a Moog synth even if it had only one osscialtor. Look what Wendy Carlos and Tomita did with Moog Modular synths.
Hope this answers your question Equlaizer?