People often get jacked at the transaction point in these atms and yet they still draw interest.
Some vendors hide the actual fee in the conversion,for example here they exchange through currency and bitcoin.
So if I buy at say 6% fee it is that and whatever they decide to give me in the exchange from CAD to USD.
Being that it is roughly 25 cents on the dollar they can give the buyer 70 cents instead and take 5 more percent.
The few times I use a atm I always end up wondering wtf happened here!

Was a well back that I was reading about Philippines atms having fees that where way out to lunch. Like I think it was over 20%.

Its the same with the giftcards scene here,people offer 1/5th the price and just sit back waiting for the sucker.