I'm glad that they didn't alter the progression of the game immensely, but I still strongly feel that these types of transactions shouldn't be a part of a full-priced game. I shouldn't feel inconvenienced or have to go out of my way to acquire a virtual good in a game I already purchased.

Even if there may have been no harm in this version of GT, like there wasn't in the previous Forza, we've seen where this route leads game design. Eventually these microtransactions will affect the game's balance and developers will be motivated to decrease the credits that players can earn freely to motivate them to purchase extra credits.

Even if you don't support the microtransactions, and even if you don't purchase them, they will effectively affect your experience sooner or later. If you don't take my word for it, please take Jim Sterling's.