@AlexA
It may be that time is the great equalizer... In the early '90s, one of the earliest non Olympic higher value NCLT series issued was in celebration of Canada's history of aviation. This series was 10 coins, each 1 ounce of Sterling for a total of 9.25 ounces of pure Silver. The issue price was $55.50 each or $555 for the set. Included in this set was a coin depicting the Lancaster Bomber which was a runaway success at the time; even with a mintage in excess of 40,000 this reached in excess of 3x the issue price; Charlton today lists still lists it at $135-150.
In 1990, Silver was around $4.50/Oz or $5.40 CDN. So in context, the Aviation Series 1 was sold in the early '90s at an 11x markup on the bullion cost ($55.50 for $5 worth of Silver).
Earlier this year, I picked up a set for $300 at auction including fees. Not only is this 45% drop in raw dollars, it completely ignores approximately 60% lift due to inflation... i.e. the $55.50 spent in 1990 equates to around $90 today in 2018 dollars.
Since the 1oz coins are sterling, the 10 coin set adds up to 9.25 oz of silver and at 1x-2x bullion, that would be a range of $185 - $370 based on a $20CDN ounce (Today's random date maple cost is $23.25 CDN)
This is a pattern that is repeated over and over again. All of the $100 proof Gold issues older than 10 years routinely trade for bullion equivalent.
It makes no financial sense to pay even the
RCM's inflated prices for silver coins let alone any juice added by a temporary interest bubble such as was generated for the Falcon Lake coin. One area that has improved... the
RCM only marks up Silver by 5x-6x these days

By the way, I really like the Aviation series and am happy to own it. Buy what you like because you like it or it fills a gap in your collection... don't buy it for investment... unless you are a short term flipper and are very lucky; the trends are just not in your favour.