Yeah, that stuff costs you money to do though. There are other ways to handle such situations, i think the best course of action kind of depends on a variety of factors
.. the way the civil war trigger and powerbase interacts means that it is favourable to increase the powerbase of predictably loyal characters, and you can do this with (Predictably loyal - for example family and friends of the ruler and characters with traits that make them loyal over time)
Granting holdings to govt office holders is also the only free way to bump their loyalty towards 100 to generate more influence...
Imperator has an increasing number of game systems that come with corners you are able to cut if you are playing some kind of greedy ambitious game where you push up against one or more great cahallange... but given a less ambitious approach, you can kind of pick and choose which systems to engage deeply with. I like that.