I can under stand how you feel, but think about it, they might have a tight budget and they can only pay this way buy using change from their own transactions. I have a famaliy that paid cash in notes and now he's lost his job and she is about to have a baby and they have paid me like this the passed two cleans. I'm not going to drop them because they bothered to explain why. i just use this money as float money, like if I'm out and want a cup of tea paper can of coke that sort of thing.
Good point, the way some custies are, I'm happy if they pay on time and in full. If they always pay this way, then if it causes problems or extra cost to book it into the bank, then stick a charge on top of the price.
I've got one custy who has the bailiffs calling soon to collect a debt of about 40 quid. Including costs, she will end up paying more than double that to the bailiff.
So as long as it's not a problem paying into your bank, just accept it mate.