Some vintage versions it can be a rare plus. I would have to dig out my S&W book to see for sure, but nickle 58's are not that common, because they were largely intended as issue and service pieces. In the case of this 58-2, I don't think it adds any value to it, even if it was an upcharge on ordering.
Marky-Mark, if you are thinking about offering $1000, offer them $900... and let them beat you up to $1000, or tell them you'll give them $1000 for it, out the door (with tax, etc.) If you really want to wait for a true 57 or 58, I would, but you very likely won't bet getting it for $1000, unless you luck into one, or there is something wrong with it. Looking at GB, right now there are 6 58's of various condition, ranging from a bid of $1013, to a BIN of $2150... so you can see what you are up against.
I would tend to agree, but I don't know about 'ever.' In 20 or 30 years, who knows what will be a worthy collectable and what won't. If I had my crystal ball, I'd still have a bunch of the stuff I threw away as a kid, or discarded as I moved or whatnot... and a few firearms I would have held onto, waiting for 2020 when the prices for pretty much everything went bonkers. I will agree that the lock will be a detriment when put up against a non-lock version, all else being equal.