I was in this mindset before but I have recently seen online just how much some people spend at Galaxy's Edge. I am a Star Wars fan, I don't buy any collectibles or anything I just really enjoy the whole IP, I watch the movies, read the Vader comic series, and play any Star Wars video games they make. After browsing online in places like the Galaxy's Edge subreddit or on Twitter and Instagram, some people go absolutely nuts spending wise that I highly doubt would have gone anywhere else in the parks. I see people posting hauls where both people in a relationship build lightsabers and droids, plus they buy a couple of the legacy hilts, or sometimes a lot of legacy hilts, some extra kyber crystals for their sabers, a holocron, some clothes. and some accessories / toys / extras. This doesn't even account for the blue milk or green milk they try, the ronto wraps they try, any drinks they try at the cantina, etc. I have seen a very large number of posts where people buy 1-2 Savi's sabers ALONG WITH about 6-7+ legacy sabers. That's basically a grand sans any extra blades, kyber crystals, covertech clips, etc. I highly doubt the people doing this spending would have gone this wild at the Emporium, for example.
That said, I am completely aware this isn't the majority of guests in Galaxy's Edge, but I don't think it is fair to say this money would have been spent elsewhere in the parks. For me, I really want to build a lightsaber at Galaxy's Edge. I would have to see how much money I would budget myself for merchandise at the parks and see if it would make even a little sense for me to build a saber, as I know $200 is expensive, but I really don't buy a lot of merch when I go to the parks. I will buy a shirt / sweatshirt and maybe a hat, along with a few pins because I like to collect pins and bring some back for my friends as gifts. So taking me for example, I would maybe spend $80 (being generous) on merchandise, the rest is usually spent on food in the parks, but the saber experience is making me consider spending over twice that number for one item / experience. Again, everyone's situation is different, but I definitely believe these experiences and Galaxy's Edge in general are getting money out of people that wouldn't spend it elsewhere.