I'd be interested in any comments http://rover.ebay.com/ro...9&mtid=824&kw=lg

I don't know anything about 1940s Kashans, but I note that the seller says 150 KPSI whereas the tape measure suggests more something like 100-110. Also, a lot of nonsense in the description, but I guess that's irrelevant.

If the rug is in good condition and the pile is even and thick, then the asking price is fair for a Kashan of that size, even one of this weave. I believe it is mislabeled, though. This rug is more like circa 1970s than 1940s. That mustardy-yellow-gold color is indicative of the '70s.

The description on most ebay offered rugs is not correct. Jahann`s date is correct, my guess would be even younger (1980`s - 90`s). And - again - it is no real Kashan. Most cheaper rugs in this design are Ardekan or Meshed. This is visible in the wool quality and the weave.
If is very ok if a rug used for at least 20 years shows signs of wear, but these lower price qualities wear faster and often have no moth protection, so the risk of getting a rug with "meat" is quite high. I recommend to have any rug you purchased washed and newly moth protected.

I would recommend asking about moth protection to any buyer of handmade rugs made of wool. It is a major problem many used rugs have. Buying rugs on ebay or auction may save you some money rather than buying in a reputated shop, but there is always the risk to bring in moths to your home that are a danger to any woolen product.
Reputated shops usually have their stuff well mentained - this means old rugs that often come in as a trade in are professionally washed and moth protected. This is protecting their investment (rugs) because the damage by moth in a high quality inventory would become a expensive problem.
It is also ok to buy an used Kashan in good condition, washed and with new moth protection. When you go around shopping ask the sellers to show you good Kashan rugs, no Ardakan or Meshed quality.