Question #1
If you were to have in your possession what you would consider to be the IDEAL chip guide (or price guide), would both chips be included, or would there be just a single listing?
A single listing. There's so many variations (real, imaginary, and worn/faded) that it's impossible to list them all. Let's go with the "intent" of the casino and manufacturer...if it's intended to be the same chip, let it have just one number. Unless, of course, it's an error...or maybe if a different mold (LCV/SCV)
Question #2
If you think there should be a single listing, do you feel that there should be a comment or note that another variation exists, or do you feel that no note is necessary?
A note would be good Just to indicate that there are one or more variations known to exist. There's a $1 Las Vegas CLub chip pictured on the board as a possible new variation for TCR #11. Allan gave a great explanation of why it won't be given its own TCR number...

Question #3
(Another way to phrase this issue): If you had only one of these two "variations", would you feel you were "missing" a chip from your collection, or would you feel that you would have to get the other one as well?
I wouldn't feel that I was missing a chip, but if I knew there were variations I'd check my dupes and keep one of each variety

Question #3a
How about some more expensive chips that might fall into this category… take for example the Riviera $25 Christy and Jones chips listed in The Chip Rack as N818 and V6945. These are relatively valuable ($200) chips and they are exactly the same with the exception of the placement of the Riviera logo crest with relation to the printing of the "Riviera" name on the chip (which might have been the result of a reorder, or maybe there was only a single run of the inlays with the dies in different alignments). If you had one of them, would you feel the need to fill the hole left by the lack of the other one?
no