Flatbed shipments only travle North

Fellow flatbeders. You know the saw mills, and a lot of other places you go to often where you know the people and the shipments.
Why is that 95% of all saw mills/lumber yards only ship lumber North? And if there is a slim chance there is a South shipment, it is gone before you know it, and paying really low.

Its like the market or flow of trucking should only go North.

 

East Coast. All my trucks mostly run East Coast freight, but from Florida to the almost the North East region, freight never travels South. Its like no one ever orders anything from the North? Really?

 

Yes that is right, but they none of them hardly ever ship anything South? People in North Carolina can not get shipment from Virginia. People in South Carolina can not get shipments from North Carolina. They have to get them South of there location. Strange as it may seem its how the market is, don't know why, just asking.

 

If I could find a map on one of my loadboards, or draw would it would look like this.
10,000 Shipments going North from Florida. 100 shipments going South in Florida.
10,000 Shipments going North from Georgia. 100 shipments going South from Georgia.
10,000 Shipments going North from South Carolina. 100 shipments going South from South Carolina.
10,000 Shipments going North from North Carolina. 100 shipments going South from North Carolina.

So on, and so on. Something is out of balance, and you can't tell me it's supply and demand, its like a market that doesn't want trucks going South or something.