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This isn't the regular first/second-bag fee you pay when you check a bag — it's the penalty on top of that for exceeding the weight or size allowance. On budget carriers especially, that penalty is often charged per kilo at the gate, and can genuinely cost more than the flight itself.
A cheap luggage scale at home is the easiest way to avoid this entirely — weigh your bag before you leave, not at the check-in counter.