This applies to all niche apps. I have a B2C niche app that makes about 1,000€ per month, which is hardly sustainable. I'm a one-man show and supporting an iOS and an Android app slows me down in releasing new features for the SaaS.
Whenever I change the SaaS, I have to change both mobile apps. This is painful.
In contrast, some of the most popular games this year (Monument Valley, Wayward Souls) have come out with premium pricing, which is a refreshing change.