Whats is the recommended number of sales for a system or a game in a week?

[lenardo]

i've played motorstorm, i've played excite truck.. of the two i prefer excite truck.. why? no idea, i just like how it plays better... as to what number..what was said before, if your competition is outselling your product by 3+ to 1, it doesn't matter how the sales are....you are failing miserably