If you don’t do the work your firm offers you, the firm will give it to someone else. The agency will imagine you aren’t a team player and it will find yourself harming you tremendously in the long term. The appropriate response is to try to get the work you possibly can at your firm with time—not flip down work. If you flip down work, you aren’t supporting the people who provide you with work.
If the people supplying you with work to do run out of labor, you’ll undergo the pain and consequence of this. Even if they don’t utterly run out of labor, they will be extra likely to do the work themselves somewhat than provide the work to do. Because jury verdicts can be huge and hiring a lawyer is dear, the easiest way to win a lawsuit is to avoid one within the first place.