Varslab is John Baumgartner, one of the finest
Morgan dollar guys alive. His opinions brook no questioning. Regarding Vams and More, that's Logan McKechnie. He's on the same level as John in terms of knowledge, and the driving force behind the VAMView Price Guide, the unofficial-yet-definitive guide for retail pricing of VAMs.
Logan's website pricing is just the same -
full retail pricing of VAMs aimed at
VAM collectors, from the one man in the hobby who probably best knows what a given coin is worth.
But all that has to be taken with a grain of salt. Not as a reflection on Mr. McKechnie, but as a reflection of the fact that VAMming is still barely in its' infancy. There are very few collectors seriously pursuing varieties, and the knowledge base of true values/rarity is barely begun by comparison to the remaining potential for our thinking to be changed in the future with more information.
So when I say that I don't really see VAM-1C as an added-value variety, it's partly because I know collector demand is relatively low, and partly because I know we really have no clue as to how rare they actually are.
As I discussed in your other thread, I know the Thornheads carry added value because they've always been in demand as unique specimens, and are therefore heavily researched and sought-after. I know the 1L and 1Y carry added value (less-so than the Thornheads) because evidence indicates they're physically rare. That's because of the nature of the defining feature - it's not something that is going to have a long lifetime on a die. I've seen a couple dozen 1L's on
ebay over the last few years - they're far easier to spot than 1Y's - but that doesn't account for relistings so even though I think the population mentioned at VAMworld is understated they're still hard to come by.
The 1Y is a different story. I've been seeking them out since being lucky enough (I think) to find the second example known; in the years since, I've only seen a couple more, including the (apparently) only one known in Mint State which I cherrypicked off of
ebay.
I'd personally pay a decent premium for any Mint State 1L, and any 1Y in any condition. But this is still only one man's opinnion, which is why your questions are so inherently difficult to answer. Morgans aren't like earlier issues where time and research has pretty much defined rarities and demand.