I print on whatever gives me an image I like. I'm kinda skeptical about how much the real or imagined nuances of the latest, greatest paper really adds to an image. I know personally that when I find a piece I like on a wall somewhere, I rarely give the media any thought at all. The image works or it doesn't, and I doubt a little extra d-max or a little more whiteness matters a hoot in those cases, or that I could even detect such things visually.
Most of my sales to end buyers are framed pieces. A "reasonably priced" framed image to which a potential buyer has some emotional attachment (read local interest) is a hugely attractive for purchase. A lot of those kinds of buyers tend to think they can't afford to have a print framed, but hey, if there's a nice deal on an already framed print, wow!
Almost all my print sales are to framers who usually frame or at least mount the print right away. They actually like lighter papers because of price. Their customers will usually never see the naked print at all, it's all a matter of markup.
You know I could be wrong about the really high end print buyers, maybe paper weight would make a difference to some of them. But those are rare birds. There's a much larger and more reliable market of folks who just like the idea of art they find exciting and can also afford.