Celebrities don’t always cost much, you have to remember that those high rates they get paid are optional, there’s a base pay for actors, and they can take that rather than their typical high pay if’n they want. Throw in that in a lot of ways voice acting is easier (no costumes, make up, no standing around for a scene to be set up, etc), and it’s effectively a quick and easy buck for actors.
DC is a bit of an oddity, it’s not a state, so there’s no governor to deploy the guard, plus much of their governance has to be approved by Congress, this is part of the reason that there’s a push for DC statehood, residents are getting tired of this mess.