There are many ancillary fees that go into running a marketplace. Whether you are selling stickers on eBay or selling beer/cider/mead on Bevv, there is a cost of doing business. Bevv's economies of scale bring those rates down but can't delete them completely.
Just a few examples are your smart pickups via UPS. UPS pickups aren't free.
Running a tax calculation engine that actually calculates both alcohol and sales taxes where applicable isn't free.
Hosting images and infrastructure on a cloud server and other technology integrations cost money and upkeep.
Grab a beer and have a thought of all the costs of doing business that you would encounter from the logistics, legal, tech, and infrastructure side of running an online direct-to-consumer craft alcohol storefront.
Exactly... Hopefully, that makes more sense.