1. I think it's always profit since the upkeep for basic trading ships is 50, less eventually. Though I've been playing with 10-ship maximum stacks so I don't know if the situation changes when you get more and more ships. I think you'll always get profit, but the amount does diminish as more ships arrive at the node.
2. Usually units rout, if you really beat them down they become shattered and will not regroup. It's very rare that a ashigaru unit decides to fight to the death, this sometimes happens in castle defense and I believe is more common with higher morale values.
3. Yes though it's much harder to incite revolts as Buddhist monks in Buddhist provinces, Christian missionaries have it easy incitement-wise.
4. Well getting a 100% bonus to any research doesn't mean the research time is zero, I haven't found any exact formula that it follows but more is always better.
5. They can be good, when recruited from a province where they get +5 experience they can really give nasty surprise charges and disturb enemy units. I've very rarely used them to by-pass enemy infantry and charge at their archers when cavalry hasn't been available. But they are at their best when assaulting large castles, they can rather easily get to the walls and with improved climbing speed they can climb up to the platform where the keep is, and capture it. Even if they can't hold it, they'll make the enemy to pull some troops back for quite a long while.
6. haven't played multiplayer myself, can't help with that.
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