Other Location for Marks?

[Heero Yuy NWZC]

So I was playing the game and heard from one of ther NPCs that there are rich people who make marks just to throw money away, or whatever. Is this really so? If yes, then where can I go to see the marks they have?

[McLovin']

Are you up to the Phon Coast yet?

[Renmiri]

And Archades too ;)