I didn't drive a single Le Mans / Sardegna grind race since selling cars was implemented, and I hope I will never have to again, I have 55 mil left, all the cars I need, so I will just need the new ones, when they are introduced in the game
Actually I started a second account recently, I'm bored with this one, nothing more to conquer, so I started fresh, driving cafe menu missions, tuning cars, driving sport mode from scratch
But no grinding this time, only smart purchases, no wasted money on trying anything because I already know what all the cars are capable of.