And Scale Auto recently went from 8 issues down to 6, which indicates the delicate balance between ads, cover price, readers, subscriptions, revenue, etc.
over the years FSM has done 4,6,8,9 and the current 10 issues per year.
my guess is that 10 issues is the current 'sweet spot' for FSM, the point where they can
still publish profitably while maintaining or increasing readership.
they have done 10 issues for a long time now.
i would think that they left off two of the prime 'summer' (northern hemisphere) months,
as that is the time when some modelers leave their work benches and go outside for something more than a trip to work or the hobbyshop.