You're a new Glitch, wandering around Groddle, and you see a thing, a bin. It talks! It says "Hey, You! I'll give you 50c for 20 cherries!" Aha! Something to do! Maybe the bin even has instructions about harvesting cherries and where to look for cherry trees. You go off, harvest some cherries and bring them back to the bin.
Somewhere, a level 20 Glitch gets a growl "Your cherry bin is full!" It only cost them 5000c to buy, they set up the prices and commodity, and wrote the instructions themselves. They pay the buy-cost when people deposit cherries (or chunks or spice...) And they get loads of cherries without having to spend the time collecting them themselves.