An original "survivor" will always garner big(ger) bucks. However it has to have some collector status associated with it to get big money from the regular collectors. And they usually pay big for the first and last in a model run. That said I would think a 1971 CB500 would garner more than a later 550 version of that family. Much like after the sandcasts the 750s take a dive in perceived value.
And be careful of the "continuation" models - like the Vic World bikes. Sold and registered as if time had stopped. This was tried with Carrol Shelby's Mustangs where they had enough leftover to continue production and Mr. Norm's GSS series Darts. They got the dollar signs in their eyes, but the general population and more importantly buyers didn't hold these new vehicles in the same esteem as those with history behind them. Pay $25,000 or more for a "new" sandcast, but don't be surprised if there's not a huge following to buy it from you at large coin if you want to sell. If they go that large on coin, they'll just get Vic to build them one.
Unless there was a person who had an identical version when new, or P.T. Barnum waves his wand, $4K for a 550 without some history or famous owner is a stiff number to reach. Not saying it can't be done but the pool of interested parties will be smaller.