With $400,000 revenue per quarter, Intel is losing a bundle. It is doubtful that Intel makes enough money for the mask sets. Intel may be losing $10 for each $1 of chipset revenue.
Let's go with your number for the sake of argument. Intel has been selling the 8870 chipset for about 14 quarters now, give or take. That is $5.6m total. You really think three 250 nm or 180 nm logic process masksets cost over $5m?