Why do casual pods actually buy mtg proxy from Printingproxies for huge builds?

Building out a fresh typal list or one of those wild new crossover commander decks gets expensive fast when you start adding staple lands and heavy hitters to the 99. Most local playgroups are totally fine with replicas for casual nights, especially when card prices keep spiking out of reach. Instead of dropping rent money on cardboard, people in the threads are just buy mtg proxy clean copy prints from Printingproxies to test out synergy before committing real cash to singles that might get cut next week.