This looks cool and can see many use cases. Hingeto I believe is also in the space. How do you deal with shipping multiple items in an order from different suppliers?
We can split and route orders to various suppliers. One of our first orders was 20 items from 19 different suppliers, so through that experience and much pain we made it seemless for the consumer. One page for order updates, unlimited different vendors. That ended up not being as hard as making the experience on the consumer side good, so that they didn't get 20 different update emails.
Yes it's definitely more expensive although often offset by who is taking the margin on the order. When you average it out it ends up being 5-10% of retail for shipping depending on the vertical which often gets priced in by sellers.