Ok, let me try to do a hypothetical situation.

You are a Hub, lets call it West Coast US Hub. You have a few stackers not that far from you who want to contribute. One mails you a silver blob, 2 more you are seeing on Friday for beers and are giving you a couple of ounces in person, another is sending you some HBD and one more has agreed with you that they can send you a paypal or direct money transfer of US Dollars.

You convert the HBD to USD, put some aside to pay for postage (with tracking/insurance), add the rest to the paypal transfer and go buy a couple extra ounces of silver, stick that silver with the rest you've been given and that then becomes your Hubs prize which goes into the MR as one prize.

Somebody wins your hubs prize and so you have to post it out. Turns out postage was cheaper than you budgeted so you spend the extra postage money on some little sweeteners and add it to the package. You have all the records and receipts so you can be fully transparent on the finances and the tracking/insurance protects you from liability if the thing goes missing.

Does that make sense?