You still don't seem to understand. You need 12-13km/s to get to anywhere useful from Mercury. Closer to Sun than Earth there is only Mercury and Venus and nothing else.
For example, if you wanted to build a base on Mars using resources that you obtained somewhere else, it would actually require many times more fuel to get anything from Mercury than it would be to get it from Earth surface.
For example, if you wanted to build a base on Mars using resources that you obtained somewhere else, it would actually require many times more fuel to get anything from Mercury than it would be to get it from Earth surface.