To people who don't know pipes, an expensive pipe can look like just an outmoded smoking tool of negligible value, so they only want a dollar or two. It's like an old hand eggbeater or a stove-top coffee percolator. Those pipes are lucky buys, since you can see them for sale for $200 or more, the same pipes. That's the only way I'd buy a White Spot, probably at a yard sale or antique shop, where I could actually view and handle the item. I don't pine for one, so it would have to be a chance purchase.
I agree with the posts that see the original post photo as a replacement stem. The stems are made with the pipes and fit precisely if they are original. Any brand, not just these.