Thanks for the replies so far... interesting information.
My examples in the pic. seem to support the poll... while I like the knife I made the open sheath for... didn't find it handy in carrying this way. May try and convert to a belt carry of some sort.
The Skyline I made "closed carry" though, I'm finding very handy... especially doing stuff around the house, I find myself reaching for it more than the pocket knife. Part of the reason I made it... I like the knife, but pretty much carry everything 'tip up' on the left... so didn't carry the Skyline much. But as a "necker", it has proven useful. Like someone mentioned... probably not as handy if I had to pull it from under a shirt, but around the house, no problem.
Anyway, thanks again... enjoying the comments and have learned a bit. Good info.