Thanks for the answer!
It's my personal point of view, I'm a retro gamer and I never bought a DLC (and I think a lot of gamers are in the same bote).
So for ME is the same thing: + cars, + tracks = + characters + stages.
Prologue is one game; GT 5 (original in platinum) are another; and GT5 XL Edition and Academy are a different game. But, I agree in the essense is the same game.
Fanatismo não leva a nada, apenas a colecionar antipatias.
Collection: Telejogo Ford-Philco, Dactar, TV Game 2600, Master System (2x), Master System Portable, NES, Dynavision 3, Mega Drive 3 (2x - Tectoy and Show Do Milhao Edition), Genesis 3, Genesis Arcade Motion, MD Play, SNES (2x), Super Famicom, Neo Geo CD, 3DO, Saturn, Playstation, Nintendo 64 (2x), Dreamcast, Playstation 2, Game Cube, Xbox, Zeebo, Playstation 3, Xbox 360 (Kinect Bundle), Wii (2x - White and Red), Game Boy Pocket, Game Boy Color, Game Boy Advance, DS Lite, 3DS, Vita, Wii U, Playstation 4 and Xbox One. Around 800 games. Preferred Generation: 16 bits.