Well they all tour because otherwise they saturate demand after a week or two in a local area. It's not about big disparities in local earning potential. Guys like novelty and even the ones that pick a girl and stick with her can't afford to come all the time.
No, prices are almost standardized, at least in the 'normal' escorting world. I was surprised by this at first. My belief had always been that it'd be super competitive and the hottest girls would charge the highest prices, but it's not like that. Turns out guys don't really care that much about what a girl looks like beyond a baseline level of beauty, which is why so many can get away with hiding their face.
What does matter a lot is what special services are offered (e.g. dominatrix stuff has a different price), and customer retention, which is 100% about whether you're nice and make the guys feel happy. The most successful girls are the ones that develop a loyal customer base. A few men even follow the girls around as they tour, but that's rare. Girls who are cold, uninterested etc don't get repeat custom and exhaust the area quite quickly.
Whether to go high end or not probably depends a lot on how much else you have going on in life. Aella presumably has lots of other projects like OnlyFans, social media etc. This girl was a full timer. It was her job, and she worked pretty long hours (not anymore). She didn't use social media or create websites or whatever. That's normal. Most escorts use ad sites but they aren't creating dedicated websites for themselves. This girl doesn't even use social media at all, not even in her personal life (and never did, and she's not old).
I did ask her once about the high end work but she indicated that at these sorts of prices you could get maybe one client a month, which just wasn't enough to be interesting given she could be making thousands per day reliably by charging a more normal price (a few hundred an hour). And of course with fewer customers you're a lot more exposed to one of them not coming anymore. The people saying "wow $1200/hr is a lot" are right, I suspect only in Silicon Valley are there a large enough percentage of über-rich but unlucky-with-women people to pay those sorts of rates. Most guys visited her around payday, it was a very cyclical business.
If you do ever get to know an escort on a personal level, or especially more than one, be aware that this is a world that will seem - to the average office worker at least - astoundingly racist. It's touched on in the article but is something else that surprised me a lot. All the girls have strong opinions about different races and a large number demand to know a client's race before they turn up and will simply refuse clients of particular races. There is no stigma or shame associated with such discussions or policies. In escorting there are no HR departments to tell people what to think, 'diversity' isn't a thing, they're all independent or at most work with one or two other girls who are just like them. Learning about this made me reflect a lot on to what extent the middle class office/tech world obsession with anti-racism is a function of the heavy level of filtering that goes on at the front door as part of selecting for skills, university, background etc. The belief that everyone is culturally homogenous and race is just a pigment, just doesn't fly amongst escorts. They learn to generalize about their client base very quickly. To them the link between race and culture is both real and of critical importance.