For those trying to argue that pandas (or elephants) have no effect on visitor numbers (and thus zoo income), just ask those who KNOW much more than any of us -- the zoo officials who are willing to pay $1 million per year to exhibit pandas at their zoo. THEY certainly think it's worth it! I've talked with some zoo folks at various zoos worldwide (Adelaide, Edinburgh, Atlanta, etc.) with pandas, and what they've told me is that the ultimate thing that makes pandas profitable for zoos is ..... baby pandas!!
*knows what damage keeping pandas has done to Adelaide and Edinburgh*
*shrugs*
~Thylo