Why not? You could use it to lower the cost of your services. (Someone is obviously earning interest on it. Better you than your bank.)
bombcar
Probably trying to avoid a conflict of interest. The magnanimous thing to do would earn interest and track it and refund that interest minus taxes to the final fund recipients- either the business or the customer. Might even be tax free if setup right.
Why not? You could use it to lower the cost of your services. (Someone is obviously earning interest on it. Better you than your bank.)