It’s actually a good idea to try to buy as many cars as possible. A few months ago there was a Suzuka tuning race with Sileighty as the meta car. It was not available in the used cars as that time so only way to race there properly was to own the car beforehand.
Same could happen in the future, maybe even in the time trials too.
As long as they are not expensive cars though, you can't expect someone with family and/or busy work like say an entrepreneur expect to have time to grind to get money for a car, in order to be able to enter a race. Rent function has made playing for them in every sport mode race much more convenient.
Not everyone is like me and some others, who have 7 million or more and can grind back the money spent on a car. So yeah, while I could afford the Wicked fabrication, I don't see a point to own one just for a livery, since I probably only use it just for this TT and then it would collect dust in my garage 🤷
And yeah tuning events are different, usually not that into dailies with tuning, sometimes I do them, sometimes not (I don't even do dailies every week). GTWS everytime and TTs too I buy the car needed. But even if it is not tuning events, you should not be required to buy a car either, and the persons owning the car should not have any advantages or perks, like someone suggested.
Renters should be equal to owners in this sense. How fair would it be, if the gr2 dailies favoring CLK LM would mean the only way to be competitive is to own one? 🤔 And imo tuning events should have either:
A) Only brand central cars
B) Cars that are in current rotation of UCD or LCD during an event or TT. PD knows which car will be available around the scheduled event times. If it is multiple cars for a tuning event available to use, it is enough if they have 1-2 available.