I have a 66-1, and 2 586-1's.
-1's aren't necessarily rare. Some -1 models are rarer than others but for the most part, the -1 in itself isn't any more desirable in my experience than other dash numbers, besides the fact that older S&W's tend to be more valuable than newer ones and some of the dash variants had mechanical or design features that some people desire over others. The 28-1 is a single instance of a very low run that isn't mirrored by other -1's.
Here are a few 14-1's if you were still looking
https://www.gunbroker.com/Revolvers/search?Keywords=S&W 14-1&Sort=13&PageSize=24
And without even following your link, I'll bet that sellars is einnic or something, with stupid prices and the guns are imports with proofmarks on barrels or frames.
Not interested in those or those stupid prices.