I don't think it's a matter of providers charging what we think we are "worth". In your message you kind of hit the nail on the head regarding the differences in how clients believe rates should be informed vs. providers. Some clients believe a provider has to be "worth" their rate and that value is primarily determined by that provider's aesthetics vs. their actual services. Whereas, most providers are pricing themselves based on how much they want to work AND (I forgot to mention earlier), ensuring they cover their operating costs as well.
Generally, I recommend that clients shy away from doing, what is it called here, hooker math? I recommend they stay away from it because often times it is rather off. Yes $12,000 gross is a lot, you will not hear the latter from me; however, it's not the net income. Your math math fails to account for overhead costs possibly ranging from traveling expenses, static incall rent, supplies, etc. Also, if the provider is paying taxes, which most are, that's roughly $3,600 in taxes for the month they need to set aside. Which SN: quarterly taxes are on the list of "banes of my existence".
Once again, I have to reiterate marketing. A higher rate provider is marketing toward a different type of client and logically that client demographic will typically have more money, but not all clients fit that archetype. There are many 600+ providers who have "average guy" clients who are on a fixed income or making less than 50K/ year (US men in 2019 averaged roughly $57,400 in real earnings). How do those fellas afford the $600+ providers? They save up. It's a treat. It's not something they do every week or multiple times a month, they aren't part of the QV or HH demographic. So it's not that it's not feasible, it's just different strokes for different folks... literally.
Finally, to wrap this up, I can't speak for what people are incentivizing. Oftentimes, the only incentives I see are the ones providers themselves value: anything regarding extended dates, travel, or timely pre-bookings when touring. Using myself as an example. My personal life is well-rounded and rather busy, so when in Minneapolis, I value clients who can pre-plan. Therefore, if they book 72H out, I incentivize them by granting $100 off any engagement and thereby putting me on target for the market, if not under market when compared to most of the Minneapolis Top 10. It's not a matter of not being able to command my rate... I just really appreciate people who understand the fembot here is a real human being with a life and that "Available now" makes me drier than the Sahara.