The problem is that over 90% of the drivers have no clue, but if it is used in high end racing in any kind of motorsports it must add a vallue so people are willing to spend money as if lower laptimes can be bought. Ceramics are only needed if you are at the top and need that 0.1 sec better laptimes to get on podium. To get there at 0.1 sec off the top it must come from your fingers, setup knowledge and ofcourse good engines but no high tech parts like titanium, ceramics etc.

The only reason for an avarage driver to use ceramics in engine and car is that they can (can! , not do) provide a better lifespan above steel but even then with cheap steel bearings it is hard to get an affordable lifespan advantage with ceramics.