The collected volumes of Image Comics.

Bonfire or grenade tossing required.

They are all worthless until demand says otherwise. It is demand that fuels value. Silver Age Marvels are not scarce by any means, even the keys (hell there are over 1500 CGC slabbed copies of Amazing Fantasy 15, let alone all the raw copies,+ CSBC, PGX etc. slabbed copies out there), but it is the demand for those issues that keeps them valuable. If there is no demand for a book, there's no value. When demand spikes, so does value. Look at all the TV fueled price increases. Who would have thought that Wild Dog #1 by Max Allen Collins and Terry Beatty would be a $10 book in 2016. It languished in quarter bins forever and couldn't be given away, but an appearance on the CW's Arrow as part of Team Arrow and suddenly people want the book and it sells for $10 overnight.

X-Force #2, 2nd appearance of Deadpool, oodles and oodles printed. Shops had cases of back issues and couldn't give the book away for over a decade. Deadpool gets hot, gets a movie and it's a hot book selling for $10-15 raw and much more slabbed.

So any book someone lists here as worthless could be tomorrow's hot book and selling for more than any of us here think it should. Books that were dead for decades suddenly become in demand because of tv and movie appearances and that is what fuels values in today's market and makes for what are the new key books. And since demand shifts on a dime these days, you can never write off a book as totally worthless.

Those 90s books we like to crap on are the 4 color wonders of the generation just hitting their 30s and their fond childhood nostalgia fueled memories and are starting to be sought out by them as they come into more life security and disposable income, and so they are starting to come to life again in that segment of the market, while non-key Bronze Age books in some cases are getting cold because the collectors are aging out of the market and not seeking the books, so demand has dropped off and with it perceived value to dealers and shops who don't want inventor that is not going to move quickly in their stores or at their tables at shows.

The market is always evolving, and whatever book you nominate here is just a snapshot for now, tomorrow the picture is likely to be different.

In this day of internet auctions, it only takes 2 to tango and 2 people wanting a book and bidding it up is all it takes to set a new perceived value for the book and the sale price sets the standard for what other people will charge for it moving forward. And there is a mob mentality. If a copy of Adolescent Radioactive Koalas sells for $10 because two idiots bid it up against each other, someone else will see it sold for that much and start looking to track down copies and then others see it is selling and mob mentality sets in and suddenly it becomes a hot book when no one ever really wanted the book except the 2 idiots who bid it up, but the spike in demand increases the perceived value of a book most thought was worthless. It can happen to any book and has happened to some that made no sense to me, but that's the way the collectible market currently functions. It's a different market than when I got in in the 80s, but then people were hopping all over small press black and white books on speculative fury until that burst and something else took its place. Evolving market. Things are only valuable as long as there is demand for it, and only not valuable if there is no demand. And demand changes on the flip of a switch (usually a tv power switch these days).

-M

To add on to mrp's epistle , a floppy might suddenly gain value among the comic-collecting community but to 99.95% of the American population it's still worthless for they have no intention of ever buying it