Originally posted by Papa_Joe I think this is the most reasonable explanation. People who want to start fast into analog photography and do not bother with the market.
And from this point the K1000 is a reasonable choice. There are plenty of excellent lenses on the market, which recommends Pentax instead of any other brand. The K1000 was built for a very long time, so there are is a lot of them available in good working condition. And they are most likely newer then a KX or KM.
Personally I agree with the postings here, that there are better all manual cameras from Pentax. As my first camera was a Chinon CE-4 I would even go one step further and recommend a Chinon CM-4s or a Cosina CT-1 with their reliable copal blind as a analog all manual beginners camera . Dirt cheap and high usability and with a bit of luck with intact light seals.
I believe this is a very reasonable explanation. They are iconic, even if they're not the best manual cameras from Pentax (not that I would know because the K1000 is the only Pentax camera I have). They fact that they have a reputation for being reliable and great for learning, probably increases the likelihood that those in the market for an SLR, but without any experience with one, would search for one.
Like a lot of people, I learned on one in a high school photo class way back in 87. I loved it. I still have it. It's in great working condition, although the light seals could do with replacing, but it isn't leaking any light yet. Part of why I love it is that it's a real workhorse, just like people say. It just keeps on doing what it was built to do, without fail. And when you have a camera that doesn't quit and teaches you the fundamentals, you're always honing your skills. There's satisfaction in knowing that every picture, good or bad, was your own.
I don't want to be a K1000 guy only though. I have a Vivitar 220SL too. It's also manually operated, and it was manufactured by Cosina. It's a good 10 years or more older than my K1000 and a lot heavier, but the operation is smooth. The light seals were shot. I tamped down some electrical tape, just inside the back (the lid rattled), while I have more genuine light seals on order, just so I could pop in a cheap roll of Fomapan and take some shots.
I feel sure that I'd love an MX, too. but I know I'd use it, not to replace the K1000, but to make it last longer by trading off from one to the other. It would be cool if I'm still around another 30 years. It would be even cooler if my K1000 was too, and still working.