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It's good that the rugs you have are satisfying. I've seen 2 or 3 pieces in person which had been gotten through eBay where the colors had run so hard it actually looked like a rose colored wool was used throughout the whole rug. Although I would imagine if it's practically indetectable most people don't care.
I know hear what you're saying about the "in the design of" what would be a Persian style. It would actually surprise many people to know some very, very high quality rugs are being imported from India to this day. In fact, there are also several books which mention some Persian Designs may have originated from Indian weavings some 4 centuries past.
It is true as you mention that many of these lesser quality mass produced carpets are coming from India, however such is equally true of Iran and even Pakistan and Afghanistan as well. In all honesty, almost any rug producing country is going to have their junk rugs. Ikea and Costco for example have pieces which have given the industry a bad name. I went to Ikea maybe 3 years ago and came across their "Hamadan" rugs from Iran which were of surprisingly poor quality. I couldn't believe how awful these rugs were - disposable pieces, and quite often worse than tufted rugs. However, I have also seen some extremely high quality Indian rugs.
Some of these big sellers on eBay you have to know what to look for. I remember one piece I happened across the seller stated in the item description the rug had a signature. I looked carefully at the carpet as photographed, and when I came across the signature, it was actually a patch which was cut from another rug! I couldn't stop laughing, but at the same time, it's a little sad because these sellers exploit misconceptions buyer's have. The public believes that there is something to a rug having a signature, which is not entirely incorrect, but is really more relevant to carpets produced many years ago... But to take a signature out of one rug, place it into another, and then make the claim the rug is signed? It's just not good business. Especially when they say the rug is a 100 year old museum antique which shows foundation.
It's great for someone to pay maybe $400 for a 9x12 because they don't want to have to care when their dog throws up on it or something. But when a seller says the rug is vegetable dye, or 100 years old and handspun wool, people take them seriously. This creates a problem for the honest rug people and scams the bidders who inevitably will be willing to spend more.
I have heard many of these goods found on eBay are actually from when the embargo was in place. They're carpets which were tied up in Iran due to the import laws in the late 70's. A great deal of the stock was subsequently used in Iran, and now has become more available to the Western Markets through these importers on the East Coast.
I guess after all is said and done setting condition aside, it's pretty amazing to be able to have a hand knotted rug for $2-4 a square foot that could have taken upwards of 8 months to make.