I don't mind that people can pay to get things earlier. I remember the first 2 GTs I quite enjoyed buying a cheap car, improving it and learning it, new cars were bought when I needed them. If I were to get the best and rarest cars early, I think I'd be missing out on a lot of the game anyway.
But I think they do need to be careful about putting too much grind in for the people who don't want to 'cheat'.