Let’s keep in mind that Slitherine isn’t the only party guilty of this. I know the Shadowrun games are not going to get updated, SE had a lot of players wondering about the future of a number of (expensive) Final Fantasy titles, and whoever owns the Civilization and X-Com licenses seems to have neglected them.
To compound this, dome of these titles are having holiday sales. X-Com, for example, just dropped from $10 to $3, a steal I normal times but unaware buyers might only be getting the game for a few weeks.