MGS wouldn't have nearly GTA 4's budget, because they don't anticipate nearly GTA 4's sales. Not nearly, not ever.
So assuming that the $100million is just employee's salary then that means each employee there makes $25k/year which is way too low. The average up there is probably pretty close to California so that number should be around $50k/year (very light assumption there).
100 million divided by 100 employees is a million. Divide that by four, and you get 250,000. Not 25,000. I'm not saying there aren't other costs, i'm just pointing out that your math was wrong by a factor of 10.
Take 2 claimed their team size was about 125.







