I did not do them any favor - I did the IETF a favor (as the then ISOC VP for Standards)
Really, if you didn't make the opposing party pay for your time, you did them a favor. It's absolutely expected to pay hostile witnesses for their depo time. (If nobody mentioned it, why would they offer to pay if you were willing to do it for free?)
If it happens again, pick the highest rate you think you're worth and double it. If you want, donate the money to the IETF trust and encourage them to use it for better cookies.
R's, John