Nobody forces you to
BUY IT...
Don't buy it my friend, where is the problem? Oh, I know - you'd like to have it, but for free. Well, really?
In that case, I wish you to work for free in your life - at least in Croatia you can do it almost everywhere, go to Dalamacijavino or any other bankrupted company - and feel the joy of giving someone something made out of your own work without any compensation.
Prior to the release of the game all imaginable content was well known on the very official pages through deeply informative posts about the incoming game, and we're talking months prior to the release.
Thanx to PD, those articles are still available on the very same page:
http://eu.gran-turismo.com/gb/news/sp/d14589.html
http://eu.gran-turismo.com/gb/news/sp/d14247.html
http://eu.gran-turismo.com/gb/news/sp/d13413.html
Only thing I can find there where something was left out although being announced is point-to-point Course Maker courses which we'll eventually get someday. But that is not the issue here.
I really do not see your point, sorry. If I was either PD or SCE and I invested some serious manhours into producing some additional content for my product, be sure I would also ask for a financial compensation.
And really, paying an amount of 3 coffees in local bar (Croatian prices here, in London you can buy one coffee for 3 euro) in order to get an asset and functionality you will probably use for hours in game you allegedly love to play.. well, really, don't be such a nitpicker. Really.
Because, at the end - nobody forces you to pay anything. Really.