Sometimes I do think about getting the DLC, but I also feel like it won't offer much in the broader scheme of things to me, other than credits. And I feel like I'm already doing pretty well on credits, between new GT League rounds and often doing Sport Mode races. I feel especially good about the rate I'm saving credits when it comes to cars that I may need for specific events, as I think I'm largely all set, barring another race that requires an expensive garage car, like that one Nations Cup round that required the vintage Aston Martin racecar.
In fact, I don't know if I remember the last time I had to buy a car specifically for Sport Mode or GT League. I think all that's mostly left at this point is some Gr.1 cars, VGTs, and the vintage stuff like the Ford Mk.IV, but I already bought the Ferrari 330 P4 if they add more rounds to the Nostalgic 1979 event. It's not like you can really use your credits for much other than simply buying cars, and I don't think you get much in the way of experience points, either, unlike the other campaign events. So I might ultimately pass on the DLC, unfortunately.
I don't know if I'd spend half, or maybe even a quarter of the total prize money, if I bought all the cars I didn't have yet. The possible total, I think, would barely break 100 million in costs. Like I said, it'd mostly be Gr.1 cars, VGTs, and the most expensive Gr.X cars, even though I already have all the Red Bull cars and a Ferrari 330 P4. It's not like we could use the LH Edition Mercedes-Benz VGT for anything, either - except maybe put it in a scapes photo to exhibit our mastery of the time trials. But I think if I could get those wins/poles trophies, that'd be an even greater demonstration of skill, especially since I'm trying not to purposely tank my ratings.