You have people right here on this thread that want them, but can't find them.
Manufacturers will always be motivated to make what sells. That's what they do. They do things that make them money. They don't do things that don't make them money.
If enough people wanted gloss finishes, then manufacturers would make them (and figure out ways to make them for less cost). But when manufacturers started making matte finishes, skipping the finish polishing steps, and people kept buying the product - the manufacturer's learned that folk didn't seem to mind and weren't willing to pay extra for the more costly glossy finish.
As an example - for years, Remington kept the gloss finish 700's and Wingmaster 870's in the catalog along with the cheaper matte finished units. You know what sold by the metric buttload? The cheap matte units at Walmart. You know what didn't? The nicer-finished units. Sure, it may have been nicer / better had Remington figured out how to make a better finished gun for less money. But they took the easy way out - they hit a price point by reducing the quality of the product - and the strategy worked. People bought the cheap crap, and ignored the nicer stuff. You know what Remington learned? That folk mostly won't pay for better finish, and it wasn't worth trying to keep a separate stocked item for the few that were. Nobody *forced* the 870 Express buyer to buy the Express Model instead of the Wingmaster - the buyers made that choice freely, based entirely on price. The buyer drove the market dynamics, and (assuming that the market is open and free) that's usually the way that it works.
Same with Leupold, for example. They don't make many runs of gloss finish rifle scopes any more, because resellers can't move them and they collect dust on the shelves. If enough folk voted for nicer finishes with their wallet, then you'd have a marketplace full of nicer-finished products.
But it's not as if Leupold or Burris or Vortex are gonna make seventeen gloss scopes and seventeen thousand matte scopes, just to serve the market of those seventeen people who are willing to pay more for the glossy finish. If they did, y'all would just gripe that they did it in the wrong model.