Handmade rugs take forever to make, can last for generations and be decent investments if picked right. Machine made rugs are poor imitations in comparison.
From:
http://www.chiefdodge.com/HowTo/navajorug.html
The creation of a Navajo rug is an extremely labor-intensive process. Many weavers raise their own sheep. They shear the sheep, clean, card, and spin the wool, and dye the yarn. If the dyes are vegetal (plant based) there is the additional time spent gathering the plants from the far corners of the reservation. Vegetal dyes all have unique recipes for the colors, and some colors require extended dyeing times of two or three weeks.
Before a weaver can begin weaving, the warp thread must be put in place. Once weaving begins, the weaver can average about 1 inch of length every 40 hours or so, depending on the complexity of the rug pattern. The patterns exist in the weaver's imagination, they are not written or drawn out before weaving begins.