Not sure about this...you be the judge. Does one miniscule different on a $20 bill make it worth so much more? http://cgi.ebay.com/currency-error-/220726873248?pt=LH_DefaultDomain_0&hash=item336458cca0
Judging by 0 bids I'd say most people don't. I wonder how common it is. Or how easy it would be to remove those.
Quick look at the seller listings/sold items suggests he/she is really not experienced, soin all probability may be generalizing that any error is worth $1000. Just thinking
Or maybe the counterfeiter forgot to put them on!LOL Not all counterfeiters are criminal masterminds, I have met a few that were just your average dufus thinking they could print money,and nobody would know.