It hasn't done well yet, but I think it will in time. The holidays are very busy right now, and PS3 owners are buying a lot of games. The season is too crowded for a game like GoW Collection to stand out. However, the next couple months will be somewhat of a dry spell (there will be some big releases, but not as many), and the game will stand out more. Also, a lot of people will be buying the game once God of War 3 comes out, and that game should have a big debut.
I'm stunned that OP and Monty think that almost 500k from just one region is anything other than brilliant.
They've spent next to nothing creating the game. All they've done is take two games they already owned and slap them together with some sharpening of the visuals and a sprinkling of trophies.
That's almost 500k copies sold, profit made, effort and expenditure close to nil.
I think it's worth bearing in mind that, although the package is made appealing by offering two games for the price of one, it's also going to be a turn-off for so megamers who don't fancy the idea of spending a fair amount of cash on touched up versions of last gen's material.