This won't get Bali floods of Gin'ral Grants from American visitors, if they require a $50 visa fee. I recall that several years ago, France got upset that USA required the French to get tourist visas, so France required Americans to get tourist visas before arriving in France. Surprise! American tourists stopped going to France. I think it took the French government about 90 days to back down. I predict the same thing will happen here -- Americans will go to Fiji, or Tahiti, or some other warm place, and skip Bali until the fee goes away or is folded into the airfare.
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"If you want to win the game, write the rules."