1) Speaking for HD Cam, since Cam4 began offering HD stream and noting it on the site, with a separate link for models offering it, I reach the Top 5 viewership within 15 or 20 minutes, vs. a half hour to 45 minutes or not at all. As a "daddy" performer, I am unavoidably one of those with imperfect skin, and negative/troll comments have definitely gone up - BUT, my show income has almost doubled.
2) One solution I've seen a lot for HD video is to
film your scenes flat.. This creates a slightly ghostly, ethereal feel to the finished product, which can be cool, and eliminates a lot of a model's blemishes and imperfections.
It can be a little tricky, and if you're married to a style that requires a lot of texture or color contrast (ominous, dungeon-y feel) then you won't like it. The key is to use your lighting all around to remove any shadow. For any extreme close-ups, position the camera at a medium range and zoom in instead of shoving the camera up close.
Then when you're editing, open the exposure or pull down the color saturation and contrast a little to "flatten" the image. You can compensate the washed out image a little by bringing up the color vibrance.
Your end product will have a different feel than you're used to, and it will look like a different director shot the scene. But, the method is highly effective for blemishes and wrinkles. I've only experimented with filming flat recently, haven't done any final product yet, but what I've done so far takes 10 years off of me.