If you guys could go ahead and restrict the use MBs while being on another world

[Seraphor]

I don't have the ability to sell on **THEIR SERVER** which is the whole point...

How is this hard to understand?

What tangible difference does that make?

You are selling to all players on all servers already, thanks to their ability to buy from all worlds.

Because the sellers don't have the opportunity to sell directly to those buyers...

You have never and will never be able to sell directly to anyone.
You don't chose your buyers, your buyers choose you.