Quality chairs are worth it. I bought a used Aeron chair (probably surplus from the dot-com crash) a decade and a half ago and, aside from the armrests that my cat tore up, you could still mistake it for brand-new.

Wait, let me make sure y'all understand: the whole back and seat are mesh, yet it's still perfect after decades of daily use. It hasn't even stretched, let alone torn. That's crazy! I don't know what kind of carbon-reinforced alien supermaterial it's made out of, but I assume it's gonna give me cancer or something 'cause that shit ain't natural.