Utterly Mad

$30 seems entirely reasonable for both of them honestly, it's like £20, considering the amount of work that's been put into both of them it seems fair.

It's entirely up to you, but it's less about the amount of work put in and more about the amount of work that's been put in VS the amount of content in the game.
That being said though, it's better than buying towns (abandonware) or gnomoria. (half implemented features because the devs decided to pull a Bethesda.)