I got to thinking last night, and I'm glad someone brought this up, but it seems to me that troop upkeep is pretty hefty, don't you think?
Don't get me wrong here, I know the purpose of it, but I would love to see more large-scale battles of 3,000+ men fighting it out, but unless you have a very hefty gold flow coming in, it's rough to maintain 2,000-4,000 between even 2-3 fiefs.