You can be part of the solution. Bring a working game to the show; and meet local collectors on setup day. A lot of people take pride in what they bring, and approach it as 'a show', like dog show, horse show, reptile...
Or, you can just get on the inner-web and rag on what others are not doing for you.
Yeah, admission dollars are needed too, but *public* usually covers that end of the pinball shows.