advantage of credits vs local money is that the cost of credits is lower as you buy it by larger batch. It's a way to reward bigger buyers which would be confus

advantage of credits vs local money is that the cost of credits is lower as you buy it by larger batch. It's a way to reward bigger buyers which would be confusing when using local money ("get credited of €215 when paying €180" ? what about refund ? invoicing unit ?) And as resources can be micromanaged (per hour, via their api), you'd end up with tiny fractions of local currencies and rounding issues while all credit operations are done on integer afaik.