First, take into consideration the installation cost of pallet rack vs. $0 installation cost of stacking racks...just drop the posts in and go! Next consider the flexibility of the stack rack system, allowing you to more efficiently handle your product. Many companies are finding that the labor and time savings of portable stack racks far outweigh the initial cost of the racks. Tire racks specifically save enormous amounts of time and manpower. Finally consider that stacking rack can be condensed down and put in a corner during seasonal flow allowing for more efficient movement around your warehouse, so no take down cost associated with disassembling or moving racks around your warehouse or to a different location.
All in all, stack racks offer more flexibility and over the lifespan a lower total cost than fixed racking.
If you want to learn more about portable rack (http://www.tier-