Why do 60mm blades dull faster than 45mm?

Workload — the big cutter gets the thick stacks and batting rolls, so each blade does more cutting per session. Studios cutting daily budget a change every 2–4 weeks.

What does a dull 60mm cost that a dull 45mm doesn't?

The whole point of the size — its throughput advantage disappears the moment it needs pressure, and pressure across a 12-layer stack shifts more fabric than any 45mm cut could.