Even without the DOF and RA, I think the embassy is much more valuable than 30 gold. It could easily be the difference between a DOW or not. Or a DOW being bribable. Just off the top of my head, there is all the friend-of-friend diplo dynamics. Like I said before, I think you have been handicapping yourself! I can only speculate that you do not have a sense of the usual pace and rhythms of the game. Not that there is anything wrong with domination, and that is the play style where many (most?) gamers end up, but are you already bored with Deity? Or did you just never get there?