A rate of commission is paid on them. So lets say a one4all voucher was redeemed for goods worth €100. The retailer pays a commission on this. Not sure of the exact rate but another poster stated it has gone from 7% to 15%. So An Post used to give the retailer €93 for the €100 voucher and according to the other poster the retailer now gets €85 for the €100 voucher. So they are making a loss as opposed to selling €100 of goods for cash.
WTF, An Post already make a profit when the voucher is purchased, something like EUR 1.50 per voucher. Surly there should be no charges and the profits for An Post et al would come from the interest in the fancy current account that holds the voucher funds, well ok thats not likely.