Prices for anything including comics are a function of supply-and-demand. What's made the equation different for comics in comparison to stamps or coins is that certain individual comics, titles and genres are far more popular with comic fans/collectors and thus in much higher demand than are others. For example the horror and Marvel superhero genres are far more popular than most other genres. In contrast demand for any country's individual stamps doesn't vary that much across these individual stamps. A collector typically wants them all so scarcity is therefore the primary determinant of price for stamps.
But there's another factor that's become a major determinant of comic mag prices. Because comic prices have risen in the marketplace, they've attracted the attention of investors/speculators whose interest is profits not comics per se. This has added enormously to the demand for comic mags and has thus pushed their prices up exponentially. This has fed on itself as many/most comic investors have taken past price increases as the rationale for future price increases and thus extrapolated past price increases on into the future. In the investment world this type of technical investing is called trend following, i.e. "the trend is your friend".
But statistically nothing can grow to the sky. Such "follow the crowd" behaviour creates a bubble which eventually bursts when prices "hesitate" for whatever reason. (Read the investment literature on price bubbles throughout history including the Great Tulip Bulb Bubble.) When all the trend followers decide the game is up and try to get out (dump their "investment") at the same time, the quantity supplied to the market is enormous and the price crash is cataclysmic.
But the speculation in comics has not been evenly distributed across the board. It's not much impacted those titles collected by relatively few comic enthusiasts, e.g. Patsy and Hedy, Homer the Happy Ghost, Andy Panda, Jughead, Atomic Mouse, A Date with Judy, Flippity and Flop, Fox and the Crow, Submarine Attack, Hot Rod Racers, etc, etc.
Thankfully there's a quick and easy way to determine which comics have seen the greatest influx of speculative demand and are thus most vulnerable to a price crash without the necessity of painstakingly tracking and comparing prices over the decades. The comics for which there has been the most speculative investment demand have also been the ones most often slabbed to make them fungible, i.e. a commodity that can be exchanged for an identical commodity. So check the census data if you want a quick proxy for the comics whose prices have been most inflated by speculative demand. The comics with the largest census numbers are the ones most vulnerable to a cataclysmic drop in price.