I replaced the battery on my kindle 4 not that long ago. It had the best UX for extended reading when compared to newer kindles.

The biggest downside was not having a frontlit display.

I recently switch to an xteink x4, and found that several others in that community migrated from kindle 4s as well. So there are still some number of users in the world that value the device.

I'm sure there are, I didn't mean to imply otherwise. It's just that the numbers are relatively small.

I'm actually surprised that Amazon didn't offer to do a buyback of them.