A zesty debate is forming betwixt myself and another player.
There are rulings, allegedly by Lukas, that "spending 0" is not the same as "spending". This is why Yog.0 can still be used to break RSVP (assuming you have a data sucker token about) since "0" is not a subset of "any" (RSVP has one subroutine which reads "the runner cannot spend any credits for the remainder of this run").
The latest FAQ states that "all" DOES include 0.
Nisei Division, as spoiled, reads "when you and the runner reveal secretly spent credits, gain 1 credit".
Should that be "when you and the runner reveal ALL spent credits"? The debate arises in that, if one or both players spent 0 credits, they didn't actually spend any credits, and thus the corp does not get a credit. The debate further goes on about whether or not the CORP has to spend a non-zero amount of credits, in order to gain a credit.
My reading of this is that the effective interpretation should be "all" - i.e. regardless of whether or not either player bid more than 0, or none of them bid more than 0 in secret, the corp still gets a credit. I may well be wrong - but I'm having trouble locating much of use on the Internetz.