said by yyzlhr:
THe 75/10 code is a "higher upstream" tier and it will not populate on accounts where the service address has not been marked as "higher upstream available". If it does populate for an address that hasn't been tagged, the rep will get an error if he/she tries to add it to a customers account.
That's what I mean. I don't think they're tagging accounts with "higher upstream available" anymore. I have 150/10 so it's pretty obvious that I have higher upstream available, but since they haven't added that "higher upstream available" flag I can't get 75/10. So I think "higher upstream available" was probably only added during the testing period before 150 was available. Now they don't need to say "higher upstream available", they can just say "150/10 available".
Could be totally wrong, and I'd be happy to find I can get 75/10 in the future, but I'm not holding my breath.