Disnut, your cab driver was referring to the fee that is charged to day-visitors who want access to "The Dig". The Dig is an absolutely amazing aquarium at Atlantis! I think that they charge $25 or so per day visitor, and they run little tours through The Dig.
We went to Atlantis resort a few years ago, and we LOVED it. We got a deal through Travelocity, and through a series of lucky events, we ended up upgraded to a Jr. Suite in the Royal Towers. We've never gone back to this resort, because we couldn't afford to get anywhere close to the same type of room again, LOL! It was a once-in-a-lifetime kind of trip I think.
I agree about the food prices at Atlantis. Holy cow! I wish we'd brought some shelf-stable food with us. We would have if we'd known how expensive the food was there. There are meal-plans that you can buy, but they weren't available when we went for some reason.