I mean when I went to Disney world last year there were people willing to wait in line for more than 2 hours for even just one of the Avatar rides (one that only lasts maybe 5-10 minutes at that), so clearly there are people who are enthusiastic enough that Disney felt it was worth spending ridiculous amounts of money on a giant fancy mini-mountain imitating the floating islands biome from the movie among many other areas and environmental set design dedicated to the movie. There were plenty of people, both kids and adults, buying stuff from the gift shop as well. So clearly the movie has a market even if people on Lemmy aren't personally into it.