"I made an LD commerce game on my hell map and it's hell."
HAHA - what were you thinking? LD on large maps is a DISASTER. I saw that game and initially joined, but then saw it was LD and was immediately, "Nope, outa here..." lol. I played SW Galaxy map with LD once ... and of course it VTE'd b/c no one wants to spend that much time on each move.
"It seems like the best strategy for commerce is to keep peace at all costs and just wait for all of the other players to waste their troops on each other while you stack and stack and stack."
Don't think this is specific to Commerce games ... it applies to any FFA, at least those with fog where you can hide your troops and/or income from others to some degree and downplay your ability to win in the end. Your chance of winning a 40 player FFA is 1/40, so you shouldn't actually expect to win. LOL