Keep in mind, guys, that not all of publishing behaves the same.
For example, confidentiality provisions are far from
uncommon—perhaps even the default condition—in serious
trade nonfiction, although I've encountered it very rarely in
non-tie-in fiction. On the other hand, the fact that I see these
things only when the fecal matter has hit the air-circulation
device just might skew my sample ;-)
Within serious trade nonfiction, the more-frequent users of "all
compensation is confidential" clauses seem to be outside of the big
five. Without trying to imply that these two are such, that means
publishers like Oxford University Press and Harvard University
Press (chosen for name recognition). My gut instinct is that these
publishers have… other… reasons for trying to keep
their financials as far from the light as possible.
<sarcasm> Beware that you cannot use any of this data in
trying to negotiate contracts, though, because that would
constitute an unfair restraint of trade. Authors aren't employees,
so they can't be in a union. Unless, that is, they're writing
tie-in WFH, in which case they are employees!
</sarcasm>
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