Yup, there is a huge art market for early prints like these *if* they are originals. Keep in mind these were taken in Northern India at the same time Brady was photographing the Civil War.
What's a dead giveaway is that the seller had two different people try to get him to end bidding early, a sure sign of a hot item. I saw that happen once on an old, rusty samurai sword, no fittings, just a good clear picture of the two character signature. It was a vet bring back, being sold off by the vet's kids. It started at 25.00 and ended at 50,000.00.
