While doing that in a price table would be tricky ( a nice word for impossible ) it sure seem like if OPS offered a formula that looked at total sheets in the job - then used THAT to calculate when to apply a price break, that would solve the problem. But you mention they require $1000.00 to 'add a module' - or was that some fee for support?
Seems to be solvable - in our PrintMIS system named PressWise ) we offer different formulas - one can do this by piece price ( think Business cards ) or by pages ( think books ) or by sq ft ( think wide format banners and such )
It is just math
Addon modules are extra modules... Their service/support is apart of the plan and it's literally second to none.
They offer more specific modules that are not offered in their plans. E.g book module, canvas, photobook, EDDM etc. they're not included in the standard plan. Im under the impression they're offering him the booklet plan as it's designed for similar tasks.
If OP is still reading this.
Set up a product option called "pages" or "copies" that uses a number input
set the formula ({option_textbox_value}*{quantity})*{price}
set the price per page in the pricing for that option.
Leave your product with no pricing.
quantity (pages) (100) X copies = 500.
the calulation should get you a price on the 500 sheets.
That should work.