Mannie,
To me, this depends on what the material is.
I would not put a shiny finish on most dark woods, ie walnut, bog oak, and even some of the rosewoods.
The most expensive pen I have ever had was a California Rosewood root Ultra Cigar that was finished with 5 coats of an oil finish called Arrow Oil.
Created a deep looking sheen without ovrpowering the figure of the wood.
In fact, I would say well over half of my dark woods have been finished with this.
I have also used shellac as a sealer and lacquer as a finish on many many pens as well over the twenty years or so I have been doing these
Lately, for finishing, I am getting into using Plexitone, but I have also been looking at the forum that last few weeks, and will probably go to using the oil based finishes where I can, as they do a great job of sealing without overpowering the figure (you can see the grain, and not just shine).
I think we are making our stuff "too plastic" and losing the reality of the wood products.
As for bone, antler, etc, A good fine polishing where it can be done is as good as any finish that can be put on. If there is pith however, I will fill it with thin ca many times over, until the ca is proud of the surface, then turn down to final size.
Lastly, I use Ren wax on almost everything, as this is great for keeping fingerprints down and reducing damages due to peoples acids and oils from the touching that occurs.
Hope this answers what you were asking