These bikes fall into the cracks between the collector interest areas. Lightweight collectors tend to value lighter, higher end frames and components. Balloon tire and middleweight collectors don't mind the weight, but value older bikes that are more equipped. It's not that these are bad bikes, it's just they don't hit any particular collector interest straight-on.
What's left for a market then are tag sales, garage sales, and the occasional commuter and knock-about. Those tend to be buyers looking for something functional and inexpensive to buy. Maybe that's not such a bad thing because you can still get a good one for not much money.
On 27 x 1-1/4 rims, I like the widest tire I can run under the fenders comfortably. Often that means the Panaracer Pasela, which is a good quality tire for the money that gives a supple ride. The cheaper 27 x 1-1/4 tires are awful riders, in my experience.