> 12. Led Zeppelin did not steal the opening riff of its rock anthem “Stairway to Heaven,” a federal jury ruled here, giving the band a victory in a copyright case in which millions of dollars were at stake.
> O.K., this may be a fine point. But since what was at stake was the total amount, rather than the individual dollars or even the individual millions, I would make it “was at stake.”
Millions were at stake. Dollars were at stake.
Just putting the two together doesn't magically make it singular. No one would ever say "millions of dollars was at stake."
Copyediting should reflect how people actually speak and write.