Won't be giving exact figures but that's my business model as well - I charge a premium because my job for clients is to make myself obsolete. If I "deliver" something that needs my constant presence then I haven't actually delivered. Of course, my price is high upfront because I'm budgeting in the fact that I strive to be out of there as soon as feasible instead of trying to stick around.

Some clients are ok with it, some don't; this is normal and what a competitive market should look like. I tell clients openly when my premium service is not the right fit for their current requirements or budget, and there are cases where cheaper labor or LLMs are absolutely a better fit (and they should come back once when/if they outgrow the cheaper, lower-quality product).