what do you mean with gridcoin stocks?
It's not cryptocurrency stocks but real world stocks, so yes you might argue about the benefit of these but there's certainly already a lot of money being made in this area.
But yes as of now all supported projects are science projects.
That particular project would, IMO, defeat the whole purpose of gridcoin. The whole idea is to have computation do something actually useful, and if we'd be directing it into stocks (especially gridcoin stocks), it would be no different than bitcoin - i.e. wasting increasing amount of electricity just to support the very process of wasting it.