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I leave home at 8 arrive at 830. You leave at 815 and arrive at 845. Seats for our game happen to come open at 9 and 930. With no call in system I wait 30 min and you wait 45. If we both use a call in system, I "wait" 30 as I'm driving and I wait 30 on site as before. You "wait" 30 as you are driving and you wait 45 on site as before. If only you use a call in system you wait 15 minutes on site and I wait 60. Surprise, surprise, we wait a total of 75 minutes on site, as how could calling in change the total amount of onsite waiting, when all it does is reorder the waiting list?
I don't think it works that way because the time seats open isn't static, it's dynamic and depends on how many people add their names before you. Your example doesn't take into account that when the room doesn't take call-ins, people add their names on the waiting list in front of you pushing forward the time a seat opens.
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It's not a positive feature. Adds work, and benefits regs at the expense of recs.
I think the argument that it benefits regs is the strongest, but I would think that the effect is marginal. Most regs tend to come early in the day when there are no or little lines.
As far as implementation requiring work, I was told that one big reason they didn't allow call-ins is because they had limited space on the front podium which couldn't accommodate an extra person fielding the calls.