Prices
That's why, among the middle classes, there weren't that many households that had a matched set. Typical was to buy a washer first, and then a dryer after the washer was paid for. Of course, those machines were (mostly) sturdily built and servicable, so once you had a machine, you were good for ten years or so. Of course, with new features being introduced all the time, at some point the misses was going to want the latest and greatest model!
Seriously, that was a remarkable period in Western Hemisphere history. New things were being introduced all the time that were improving the average person's standard of living. These newspaper pages are a celebration of modern life.