I hear you can get a fair bit of credits by going to the forzamotorsport.net website and cash in some of the rewards you get there, that are tied up to what you did in the game. May be worth checking out if you have the game, apparently quite a lot of credits to be had there, especially if you let yourself rank up to tier 4 or something like that before cashing in.
Although you can win quite a lot of stuff in GT6 very fast (I have over 5? million worth of cars I think by now in prize cars and I have earned 1,3 million credits), it does seem to be slightly more grindy than before. People are still finding the 'best' races for earning cash though, best I've read so far is about 40k per 4 mins, which is about half a million credits per hour. Would take long to get all cars that way though, as I think even if you stick to Premium cars, there are now 400+ of those? Anyway, I saw quite a few cars I would like in my garage already for sure that would empty my wallet immediately.
Also, Arcade mode does seem to have quite a limited amount of cars as well, something like 20.
Although you can win quite a lot of stuff in GT6 very fast (I have over 5? million worth of cars I think by now in prize cars and I have earned 1,3 million credits), it does seem to be slightly more grindy than before. People are still finding the 'best' races for earning cash though, best I've read so far is about 40k per 4 mins, which is about half a million credits per hour. Would take long to get all cars that way though, as I think even if you stick to Premium cars, there are now 400+ of those? Anyway, I saw quite a few cars I would like in my garage already for sure that would empty my wallet immediately.
Also, Arcade mode does seem to have quite a limited amount of cars as well, something like 20.