My K1K has been popular with me before and after production stopped. However, the accumulated knowledge base about how to make K1000 sound great has grown quite a bit since I've owned mine, and quite a few people are now achieving close to what K1K are actually capable of. This is leading to more favorable comparisons to REAlly expensive competition, which is spawning even more interest in the K1K.
but they are easy to drive. you can just use a speaker amp which more much more common than headphone amps.
The fact that the K1000's need a speaker amp for power makes them easier to drive? How does that make sense? Sure, maybe speaker amplifiers are just as easy or easier to come by than headphone amplifiers, but what does that have to do with the power required to drive the K1000's?