Modification isn't always about the difficulty. Sometimes it is (I've modified Monarch level to be a bit easier, but still clearly harder than Prince), but it can also be to change the flavour of the game.
The tribal huts can be popped for some random result. AI and human player get equal shot at the huts. I can easily understand tweaking the hut results (eg. switch one map to one small gold, whatever). Not a big deal.
However, any time you're talking about a game (especially if talking about the results), you should note the modifications as well.
On WB-fun: sometimes it's fun to play around with WB. Ever added 12 huts on your capitol's border so that when it gets the first border pop, they are all popped (and as they're popped by city borders, it's a completely safe pop)? Fun, although of course that'd make the game a lot easier.