I didn't get a higher salary and left a few weeks later, anyways service at BigCo (230000 names in the phone book) was not my thing, I blew everybody away in the IT department by showing them SVN (it was before git), they were commissioning the development of a custom versioning system.
The running rate for IT (not programming) work is $150/hr east-coast. That can get cut down, but is often even higher. The industry doesn't pay these techs more than $30 an hour.
I'm surprised that your contract did not include an NDA that prevented you from discussing this kind of information with the end client.
It came up when we were reviewing another consultants report, and he had put his compensation in the report. I made a comment of surprise about how much he was being paid, which pretty much gave away I was getting less and they were paying more.