How many copies does a game have to be sold for it to considered successful?

[twesterm]

To be considered a success a game has to make money. If it doesn't make money it isn't a success. It's as simple as that and that magic money varies for every game.

For a modest budget game last gen that took about 500k-ish copies. I have the breakdown of prices written down somewhere, if I remember I'll look for them later. If anything it gives a good idea of what percentage of the budget goes where.