Do you know the job of 'mysterious client' ?

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I received the phone call from a marketing research company yesterday. A kind Miss from the company asked me if I had the interest to join their mysterious client team in the spare time. She introduced some terms to me and mentioned that my actions for the duties would be treated as highly confidential. She also stated that I must keep in secret for their customers' details if I considered to join. I was wondering for this invitation and ask her how she could get my phone number and name. She explained that she found my details from a questionaire of the marketing research several months ago which I had joined, and mentioned that my details matched their requirement. I replied that I would not like to accept the invitation at present as I had few spare time in my daily life. She said no problem and asked me if I would like to accept the invitation again in the fure. Have you heard about this offer in your life? I am not sure if it is ture or not as I have not known about it in my local area. What's your opion for this? Would you like to join it if you met this case?