The last one that sold went for $150,000 but that was a WATA 8.0. The new owner is asking $270,000! This one is a 6.5. It's the second nicest copy i have seen. I would be shocked if it didn't go for at least half of the nicer one.
https://comics.ha.com/itm/video-games/nintendo-world-championships-1990-grey-wata-80-cart-0273-nes-nintendo-1990-usa/a/7261-28041.s?ic4=OtherResults-SampleItem-071515&tab=ArchiveSearchResults-012417