The Crucial component on a mattress is the comfort layers. This is what is being crushed and taking the most abuse for 6 to 8 hours every night. We could layer in materials which would initially feel good and then crush down to nothing, or we could (and do) use the highest quality, highly resilient layers that actually fight to recover from the crush. And we don't overkill, adding so many layers it looks good on paper but is just asking for trouble in the real world. All mattresses will show wear over time, but there's nothing worse than being stuck with huge 2" body imprints on your 1-year-old mattress.