We go on at least one ski vacation every season and never had to pay a fee.
Last year when my family of 5 went to the US check-in counter with total of 11 pieces of luggage, the agent had to search and find the policy fine print before letting us through. That was the only time question even was raised.
Next month we are going to CA for both Skiing and Golfing. it could be interesting, although I plan to have just one sports equipment per passenger.