You should have told them..."Absolutely, but that information would mean that you would be losing half of your placement fee because I'm not here to do your job. I'm in sales and I expect to receive commission for any placement I provide you from my network. My fee is at least half of what what you'd receive." Then you would ask for the starting base salary of the position they are placing for and do some background homework to confirm salary on your end. Calculate between 7-10% of starting salary and 50%of that amount is around what your split should be. Make sure a written contract is established between the two parties and you may even have it notarized.