From this story by The Economic Times' Hemali Chhapia:
... An RTI response revealed that the IIMs raked in Rs 28.36 crore in 2007-’ 08, up from Rs 24.16 crore the previous year, from CAT.
With about 450 faculty members in all the IIMs, the figure for 2007-08 -- Rs. 28.34 crore -- works out to about Rs. 630,000 per faculty.
[450 is an intentional overestimate. Here's a rough break-up (to within plus/minus 3): Ahmedabad -- 95 , Bangalore -- 103, Calcutta -- 90, Kozhikode -- 35, Indore -- 35, and Shillong --17. I don't have the number for Lucknow since the website is down as I write this post; I'm assuming it's about 50.].
Given the scale of operations (and from rumours we hear about GATE finances), I would expect the 'profit' from CAT to be at least a fourth of the revenues, and I wouldn't be surprised if it is as high as half the revenues. In other words, the profit per faculty is likely in the range of Rs. 150,000 - Rs. 300,000.
Not bad at all.