Your question is a very good one. There are several reasons customers like inlays, including:
- Higher friction grip (leather and micarta, primarily)
- Greater handle volume (all except for leather)
- Aesthetics
Perhaps #3 is not of high value for Somber.

For me, #2 is an advantage for for small Sebs, and a disadvantage for large Sebs -- I like the grip of a standard large Seb and value its slimmer carry in the pocket. Here are my observations/assumptions on the various inlays:
- Moisture resistance: Tolerance to moisture is one of the biggest factors I consider when choosing an inlay for EDC. My first EDC Mnandi was a gorgeous camelthorn. Between carrying it IWB during workouts and accidentally running it through the wash
, I ruined #3 (and at the same time, inadvertently improved #1
) For wood, lignum vitae and cocobolo do really well in moist environments. I've also had great luck with carrying giraffe bone. Micarta is, of course, superb from a moisture resistance perspective.
- Abrasion resistance: The harder woods are superior for not denting/scratching. I'm assuming that LV is a high performer in this category -- of course, micarta isn't hard, but tough, and is nearly indestructible. My EDC cocobolo has very small dents, but even so, still looks great after several years of EDC. Mammoth ivory is pretty soft, can crack, and I've seen a few that were carried clipped to pocket, and don't look all that great after carry. I carry my MIB Mnandi in the standard slip cases to preserve #3.
- Fracture or separation of inlay from scale: It could have happened on some knife out there, but I've never seen it, never heard of it. The mounting scheme of sitting in a milled pocket, providing a very small perimeter gap between the inlay and the pocket wall, and attaching with VHB tape is the best mounting scheme on the planet for this sort of stuff. The milled pocket gives the inlay side-to-side stability so the VHB tape's only function is to resist what little vertical tension exists. Between the perimeter gap and the compliant VHB tape, mismatches between the expansion coefficients of the titanium and the inlay material is a non-issue.
I carry my cocobolo small Seb clipped to a pocket. After years of EDC, it has a few very small dents, but still has reasonable gloss. The wood has darkened to a very rich dark-redish brown. It still looks great, IMHO. In the photo, what looks like scratches are the natural figurings in the wood that are reflecting the lights. The few marks that are not parallel to the figuring are the dents of which I spoke.
I hope that helps.