> Your reading makes the most sense to me: "whichever is higher" is just a
> way of ensuring that you never roll against a resistance of less than 6
> (resistances of 1M through 5M will just become resistances of 6, and I can't
> imagine a campaign where base resistances reached 1M2).
The rule means what it says. Very Low Difficulty is never going to be harder than 6, even if the campaign has gone on for years and years (and I've played in a few campaigns where the base resistance could reach 1M2).
Jeff