It mostly comes down to the footprint in the media... midfielders in F1 get enough attention to justify triple-digit-budgets. That's still considerably less than what the factory teams have, but only by a factor of two or three.
In sportscar racing, the privateers are lagging behind by a factor of five or maybe even ten.
Then there's also the engine/power-unit situation. Force India has access to the best powertrain in the series and that for comparatively little money... would manufacturers in P1 forced to do the same, I think we'd see more and more competitive privateers out there.
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