That is the case where it creates too much traffic.
traffic is created when they is commication, from outside, autobids just used internal processing(and not much).
Autobid can be used if it will start bidding right away
When one autobid cash will be freed there will be dosens of bids on one good player. That is the case where it creates too much traffic.
autobid can go for the final bid right away, which makes it lot easier for calculation i believe there is your fault which you make believe that this is prozessing heavy.(and everytime i see such a system implemented it does it that way)
What if you can set 2 autobids -> now there will be a big problem
i would implement it with autobid blocking the max. bid instead of current, if you have free cash after it you could use the rest to start other bids.
Pretty boring...
i like the old transfer system more too, but technically autobid should be even more easy.