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A rate limit means either you can only view one restricted article per time period, or once you've viewed one you can download all the others for free, or some compromise that fails a bit in both directions; a rate limit also allows a page to refresh itself every $rate_limit seconds and keep re-charging you while you're afk (now multiply by N tabs). There would be endless such problems because the goal itself is a bad idea; allowing people to charge you without your consent leads to people taking your money without your consent. Not being looted requires a way to specify when payment should be allowed, but only the user can decide what constitutes a fair "unit" of payable content.