Fact: Fast travel does not allow personal inventory to travel with you but if you have multiple Warehouse w/Market you can fast travel unlimited amounts of materials across grids.
Devs: To make this fair:
1. Remove the ability for Warehouse /Market Owners to create their own trade prices amongst themselves to freely transfer materials over grids without ships, but instead use Tramp Freighters.
2. Have Market opened up to everyone with Markets at the Free Ports with item costs being set by the global market against pricing standards to thwart those that want a magical safe transportation of their Warehouse goods across grids to avoid risk of losing it while sailing across the open sea.