The average hourly minimum wage in the United States is $7.50 / hr.
At 2,000,000 Cr. for the Mercedes F1, that's what, at least 2 hours to grind the shortest grindfest event to get that car.
So there's very little utility in grinding for a user (enjoyment), and there's very little cost-effectiveness even if the user makes **** money.
I have zero issue with users deciding that the opportunity cost of grinding justifies spending a few bucks on a car they want.
Would you rather spend $3 on a car, around 20 minutes of labour, or 120 minutes of labour?