In a couple instances, I've turned down work because the budget and expectations were wildly incompatible, but that's as simple as saying "I can't do the work you're looking for at that price." I'll offer suggestions for a more cost-effective alternative if I can. In one instance, that's turned into work down the line when the client came back with a different project with a budget more in alignment with their goals.
Lastly, while everything Nancy Hiller (RIP) has ever written is worth reading, these two pieces are highly relevant to the question of standards, budgets, and delivering the whole project.
https://www.finewoodworking.com/2019/09/11/dont-knock-the-la...
https://www.popularwoodworking.com/editors-blog/lets-make-ev...