Just a thought ..
When I started learning photography I was a little too obsessed into getting circular polarisers ( and infact I bought two good ones at two ends of sizes ) and for my first holiday trip out of enthusiasm i tried hard to polarise as much as possible where i sorta missed the point that the polariser was suppose to complement my shots.
Anyhow nowadays I am much more selective, if i really need to cut down on the glare I would fish for it. For scenes with already good hues in the skies there is probably little need to exaggerate it. Otherwise travelling I prefer to shoot without the polariser reducing my light.
Yes the polariser is not reproducible, but the take home message is you should not be encouraged to buy one just because it is the general consensus. But I have no better idea of how to demonstrate whether you need one or not for your way of shooting, except you try out and see.