They are so far away that I felt that the trade bonuses would be absurd. My land wasn't exactly bountiful, so it helped quite a bit. My GOTM 124 game (similar large map with 3 civs) also had a far-away Colossus, built by the Celts again. Didn't get to try largescale trading earlymidgame bc of getting Inv before Mono from a hut, so I wanted to try it out this time. Concept seems solid.