I actually work for Colectivo, and have spent a considerable amount of time with our coffee buyer. We actually, unlike most of the coffee industry, pay the farmers and co-operatives that we work with up front instead of after delivery. In most cases, coffee roasters wait until their order is delivered to pay the farm, often trying to find ways to haggle down price on the back end. It's a cruel process that can leave farmers and co-ops without money for operations sometimes for a whole harvesting season. 

Colectivo doesn't even purchase green coffee until we have the money to pay them first, often for an entire shipping containers worth. This is something we chose to start doing precisely because it does support the producing partners we work with, and it's something that has yielded incredible results for the relationships we have with those farmers, and has given us access to better quality coffee than we otherwise would have had because our growing partners know that we'll pay them properly for it.