Jennifer definitely PAID her dues to get where she is...from lowly back-up dancer to debuting as a pop artist at the age of 30...but still, $15 mil was totally acceptable. She just didn't didn't want to be paid less than Britney. The reason WHY Britney can get paid so much is because of the economic concept called "OPPORTUNITY COST" -- they have to take into account the cash she could be making from touring when deciding how much she's worth. Britney makes more touring than the entire GDP of several "developing nation" -type countries put together. Jennifer was never a touring artist, but I think she sees the failure of her ways and is trying to reinvent herself as a Britney/Madonna/Gaga type of touring artist.