What's the number a console needs to sell not to be a failure?

[Dr.Henry_Killinger]

After Deliberating with my counsel, I've devised a fool proof measure of success.

successequation = (profitability(per dollar)*marketshare(LTD per unit)) - (average unit price)*(marketshare LTD per unit))

successequation > 0 = success

successequation <= 0 failure

In order to consider the competition: successequation + e^^{[MarketShareGap(Next highest competitor price per unit)]}

unfortuantely we don't have figures on profitability...