Much silliness on both sides here.
I doubt it would be practical for Staples to tag a low value item with a tag that costs more than the item being tracked... don't expect them to tag pencils or candy bars at the check out, etc.
It would also be impractical for them to NOT tag items that are high value, when they:
1. constitute key profit centers, with high demand and high product throughput, where it would cost them far more in lost sales system wide to have empty shelves, than it does to pay for the systems, or,
2. where the high value, high demand items are easily pilfered either from internal shrinkage, or from losses on the floor.
The value proposition is having the systems will both enhance volume in the most valuable sales... and curtail the most important source of losses.
That still leaves you expecting sales to any single customer will end up somewhere between zero and a gazillion... and considering either extreme likely isn't very useful in looking to make rational decisions about the potential here.