Or, you start at the bottom of each chain and work your way backwards as stock allows. Given that numbers are mostly low single digits I'm sure you can manage to send that many emails/make that many calls.
I imagine that's actually more complex than how it initially sounds. This isn't a knock against you, I'm just trying to say that things might seem easier from our perspective than bears out when you're actually trying to handle it as a business.
Let's say that OC send out emails to the bottom four customers in a given queue. #1, who would be next in line to receive a card, doesn't check their email or it goes into a folder they don't check. #2 is a power user and before responding spends a week meticulously researching the difference between LHR and normal - though LHR we're told only effects mining there may be some uncommon use-case scenarios they want to check out, for example I checked if Folding@Home interfaces with hash rate. #3 responds, but only four days after receiving the email. #4 responds with 'I want to be transferred' the day they receive the email.
So what happens there? Imagine #4 gets put to position 1 because they're first to respond. #3 responds later and is now behind who was originally #4, ditto for #2 who has gone
up the chain now. #1, a month later, starts wondering why they haven't been getting queue alerts. They thoroughly check their email and get into a heated phone conversation with an OC rep. Are they now put in at #4? What if 35 people have replied before them and they're now all the way up at 36? What if they accept moving to position #36 in the LHR queue...and then the next day one final shipment of five non-LHR cards arrives going to people higher up in that original queue who didn't cancel?
How do you work your way around that? If #1 responds later and OC choose to honour the original position, how do you explain to #2-#4 that they got moved
up? Go one order at a time only emailing one position up once someone responds and is handled? Then you're messed up as soon as you get to someone who doesn't see the email. Work in batches for 2 weeks at a time to try and mitigate that? You get people calling and forum-posting about how they didn't receive an update this week. In any scenario, there's not a lot to automate it. It's all 1-to-1 conversations, and then another person has to adjust the new queue, and staffers deal with people who get displaced from however they handle it, and all the while they're reliant on every individual customer being reasonably vigilant with their inbox - you and I might be, but that's not everyone's experience - and having to juggle people.
Believe me, I'd be quite happy if it was a simple process but if OC staff are having to say 'it's complicated, we're going to
try to figure something out but can't guarantee anything right now because of the logistics, suppliers can't tell us anything because AIBs can't tell us anything because Nvidia aren't telling them anything', I have to believe them and hope that they manage to sort out some solution once they actually have stock and information to work off.