Is it worth keeping cancelled games and if so what do we do with cancelled games that don't have any images? A lot of the platforms that are close to 100% arent there yet because theres no images for them.

A very similar question has been answered here:

I can't add much more to that. If its a game entered by Zerothis, don't delete it for now. If its a cancelled game entered by anyone else, go and delete it. (Use the Game edit log to find out who created the entry). For those cancelled games that for the moment stay in the database I hope you can find some pre-production screenshots. Maybe even screenshots from scans from magazines would do in order to have a screenshot and bring the entry to 100%.

Edit: If a cancelled game has a prototype or playable demo it should not be deleted in any way of course.