in fact, the value of a game isn't directly linked to it being AAA, but rather to its community... the games that make the most money on the market today aren't AAA games. And even in the top 10 there are many games that are more than 10 years old...
The value of the game has a number of things to influence it, but the main thing is the community that is truly loyal to the game! Not that they want to earn from it, but that they really love the game, be it for nostalgia, for social reasons or for the quality of the game, or whatever