At 100" the packaging, shipping from china, the delivery, etc. add have to be so much more than $1k.
I bought a 100" TV with setup and it was only $1600. I don't know how they make money on that with all the logistics required. Two people for delivery, two different people for the wall hanging, all the materials for the packaging, and that is just to get it to my house.
Shipping from China to a US coastal warehouse is probably modestly under $200, including packaging, assuming it's shipped in a 40" container. Possibly less if there's other cargo that can be used to fill the remaining space.
I suspect the domestic costs are really dependent on volume (like, can you ship a container of 45 TVs to a warehouse near NYC or do you have to ship each unit individually) and I don't feel confident estimating that side of it.