Let's say a flight has 100 seats. The airline knows they need to make $20,000 ($200/seat) to make $$. They could do that by selling 50 seats @ $100 and 50 seats @ $300, or any other ratio. Now, they've apparently figured they can sell 2 seats at $100, say 10 more at $150, 10@200, 10 @ 250, etc, etc. My OPINION though is let a party book at the lowest price available at the time they book. That might mean the next price tier (or two) might be eliminated. I think it would even out over the number of seats.
ETA: All that being said, I think you and I can go around and around each stating the same thing. I'm not looking for sympathy (ok, maybe a little

), but I'm not as upset as maybe I sound like.