Inventory should be cleaned BEFORE SIA is installed, no matter what Netstock spouts. The 'robin-hood' model of letting users with higher value inventory carry the costs for lower value inventory users is so misguided I can't even find words to describe it. SIA is a tool and usage of that tool depends not on how many dollars of inventory but quantity, complexity and number of locations. If you have 100 items valued at $1,000,000 you probably don't need or want SIA, but if you have 1,000,000 items valued at $1 then you might and usage would be greater due to quantity not the value.
What happens if an end user hits a decimal out of place and jacks the inventory value for a month or two? When the end user seeks a refund for a typo this model will prove that once money goes to Sage it rarely (never) comes back.