It doesn't matter if it's the product, the packaging, or the shipping - if it involves any kind of charge or money changing hands, then it is absolutely NOT OKAY. If he offered a free sample, that would be fine as long as it was truly free. However, as you've just stated, he asked for a small amount of BTC for the MBB and shipping ... which means it was not truly a "free sample" - it involved a payment. He knows better - or at least should, and has now been given a warning. If he continues to offer "free samples" involving ANY AMOUNT OF PAYMENT/CHARGE, then his account will be deleted.