First to say that you can never take poles in the cabin anywhere. Not even inside your bag or in tubes.
I always pay to check in my backpack as I like to be able to take what toiletries and manicure items I like and not rush around buying things on arrival.
I always present myself at check in with the poles strapped on the outside of the backpack, smile nicely and ask 'do you want them separated?'. They then normally get me to take them off and the clerk tapes them together with parcel tape which they keep behind the counter, sticks a barcode label on, and checks them in. I have never been charged for sports equipment and have flown in and out of multiple airports in the UK, Gibraltar and Spain like this, using RyanAir, Easyjet, Norwegian, Vueling (subsidiary of Iberia), and British Airways. I think once I was told to leave them on the backpack. At Santiago they ask for them to be separated. I never put my backpack in an outer bag, and it and the poles have never been lost or damaged.
If you are not checking in a bag, just the poles, then you may possibly be charged, I have never tried this.