Still the problem's usually lies in the price.
Rarely happened but sometimes the publisher charged it as much as a new game's full price.
Sure they add merchs to make up the gap but sometimes the merchs are only just stickers or collectible cards.
Well, I think it would be nice if game studios remarket their old games, for the sake of accessibility and knowing full-well they won't get much back from it.
For example, let's say Sega were to release the Master System collection for the 3-D Glasses, as a VR app for Steam. Given the effort it would take to recreate, or at least port, these old games, it would be fair for them to put a price on the collection, but given the obscurity of these games and the fact it wil be for VR means it will have a very limited market. So instead of it being a big thing to market, just make it, give it a price tag under a tenner and "it's there if anyone wants it."
Now granted, as I said, these games are so obscure, it's likely no one will want them, and thus it will likely be a waste of time and effort even if they acknowledge it will be for peanuts. But still, in doing so, they would be providing access to games that are no longer accessible due to age, so it still would be something.
It's why if Sega ever did decide to re-release the 3-D games as a compilation, I think they should make "Sega Superstars VR" and release the compilation as a feature part of it, than separately. They would get more for their money that way.
But still, the original Sega Superstars game was released more of an experimental piece by Sega, who wanted to make a compilation of games for the EyeToy, knowing they may not get much profit from it, but still made it for fun and interest of the EyeToy. We don't really have "Experimental Sega" any more, so I doubt they would be interested in making "Sega Superstars VR" for the same reasons.