Originally Posted by Brobbel

I didn't say it was worthless, but I mentioned that mostly it is cheaper to book 2 discounted biz tickets. That does not include every one.

Sometimes the offer is better then 2 discounted biz tickets.
Sometimes you need the extras which are included in the full fare (flexibility, short stay etc.)
The example for the ticket bought by the employer was new to me, but is certainly also a good reason for taking advantage of the AmEx offer.

But when you're a bit more flexible, so you don't need the ticket to be as flexible, and you don't have an employer who is eager to pay the most expensive tickets, then mostly you are better of buying two discounted tickets as taking the AmEx offer.