I would like to see Southwest produce evidence that any of these have become -- or are projected to become -- popular enough to snatch up any sizable fraction of the A boarding passes. They have been around for about eight months and I haven't seen or heard any such evidence.
By the way, the reason you might get boarding pass number 10 or 20 or 30 even if you check-in right at the 24 hour mark is that connecting and thru passengers get to check in before you (since their 24 hours starts at the departure time of their first flight). What you're seeing is NOT the effect of the boarding pass sites!
If a small number of people are willing to pay a premium to get a good seat, I fail to see the harm in letting them do it. Instead of a knee-jerk "shut them down!" reaction, Southwest should think about how they can benefit from the demand for this service, perhaps by giving full-fare passengers A boarding passes, or charging a small additional fee for a guaranteed A boarding pass.
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