A while back a school did a study about he tourism claims and found many are very slanted. Millions were visiting Yellowstone anyways and they just pass around a questionnaire about wanting to see wolves, which people just checked as an ancillary interest--even though they were more likely wanting to see Old Faithful, see some 'animals' and drive in a historic park. I recall there were only about twenty people over the same number of years that specifically went to/are going to Yellowstone primarily for wolves. Tens of thousands of elk hunters were going to the greater Yellowstone area for elk and had a real tourist economic affect on the area.