I'm not an expert on CC processing neither very familiar, but I assume ibill has certain levels based on X data. ARS is the largest adult sponsor in my opinion, which means priority, special treatment or whatever you want call it. Perhaps even in the worst day of ibill the last 365 days according to Labret stantards, ARS didn't face any problem. I recognise the intelligent of the people running ARS and they were facing that serious problems they would have dropped ibill even if they had free CC processing.