"Ambiguity is not the same as opacity"

Good point. The latter is a better term.

But the spirit of either is the same because neither United nor the purchasing point makes it remotely clear that you're going to get a BULK FARE. You *might* know after the fact but even then it's not obvious - my zero PQD experience with United did *not* say anything about a bulk fare.

Forcing us to do extensive research or worse - call someone - isn't acceptable.

So the only thing unambiguous is my decision to never touch a 3rd party purchasing option with a ten foot pole. If there were obvious clarity then I'd use them, but I'm not calling someone about it, that's nuts!