Bests & Worsts Reviews from Amazon

I have used kindle readers for around 15 years now. The last 2 were touch type readers. They are wonderful while they work. I just purchased my 4 th kindle and it works great. Experience has taught me that they don't last forever. They usually outlive the warrany. Their lifespan averages around 3-5 years. Around that time they become temperamental. Suddenly pages won't turn, the font size is hard to adjust, or other quirks develop. I know then that a new Kindle is in order. What surprised me on my last purchase was the high price. All my books are safe on the Amazon website. Of course I would appreciate better longevity in this device, but I read a lot, so far I have 500+ books in there and they travel with me whenever I leave home for several days or weeks. That is a great advantage, because pre- kindle my luggage was weighed down with books. In addition I appreciate the ability to set the font size, which is something you cannot do with a print book. It would be nice if Amazon offered a discount to Kindle owners who have purchased more than 3 Kindles. How about it Amazon !?