It's more expensive than I thought it would because Kunos DLC is usually well/under priced. However if you think this is steep for just cars, cars that have a lot of work put into them, go and look how much 11 cars in Rocket league costs, or how much 11 cars in GTS will cost just to buy the key to unlock cars already in the game. That makes this DLC more than reasonable imo.20 euros seems a little steep for just cars.
I think 10-12 euros/$ would be more suitable
Im in the US and im not paying $20. Ill wait for it to be on sale if thats the case. I'll use the $20 towards f1 2020 instead