Since you are clearly not using the entire Internet, can you post the IP address blocks you use ?
The new routers can tag all/24s and your IP blocks can be properly marked as: Limited Use Away From the Global Internet.
Reclaiming IP address space is important as stewards of the resource. RIRs keep selling and leasing more and more virgin space. They could not care less about conserving IP address space. The money is in new allocations.
Remember: The only things that exist are things YOU have heard of.
"I wouldn't have known what an atomic bomb was. I had never heard of it," said Gladys Owens, 80, of Harlan, Kentucky, who was among scores of young women hired to control electric current in the calutrons on orders from the engineers.