Not understanding why people think because MS can price cut there system to a low price, means others can do the same. From what I know the PS4 is using more expensive hardware which only means that X1 will always have the price advantage. As years pass the X1 could and possibly overtake the PS4 in sales, we don't know yet and its way too early to tell. Remember it took the PS3 7 years to equal 360 sales and i wouldn't be a surprise if it took the X1 the same amount of time.
At the end of the day sales don't bother me ands you would be stupid to think a product is better because it sells more. Toyota Camry outsell Mercedes C-Class, so what, does it mean the Camry is a better car? Hell no.
What matters more is if the company managers to make a profit out of its sales. MS could sell X1s for $10 and claim winner becuase it top sales charts, this is why sales prove nothing. Profit>Sales, Quality>Sales, Games>Sales.