What Are The Most Popular Collections?

Truth! And now you know the real reason why I chose the Ike for my first PCGS graded set.

I'm surprised Peace dollars aren't in the top 10. Easy set, just 24 coins, none super expensive and they are pretty. After the Small Cents, I went to Peace dollars before anything else. In 3 weeks I'll probably have the Peace dollars completed.

Some of us over at Numista suggested reactivating the 300-country club as the 240 or 250-country club, to reflect the current number of Numista countries. Another possibility would be something like a 500-issuer club (for OFEI collectors).

...Huh. 500 issuers would be really tricky unless I go deep into Greek city-states (or German states, I guess, not sure which would be harder).

250 countries might be something to shoot for, though at the moment I don't think there's enough obvious spots for me to be able to reach that on my budget without very actively searching.
I'm at 232 at the moment (and 338 339 340 issuers), though I have a few others that don't happen to be listed on Numista, and/or that I wasn't able to attribute precisely enough to associate with a Numista page.

I think I calculated a while back that I would've already been at over 300 countries if the old system was still in existence; funnily enough, in the new system, I seem to have one less country now than I had shortly after the reorganization. Not sure how that happened.
(The extras that weren't in my 293, in no particular order: Gabon, India - Portuguese, Sarawak, Turks and Caicos Islands, Spitsbergen, England, Austrian Netherlands. I think there are others, but I don't recall them offhand.)

@jmkendall

Thank you. I agree with you listing. I'm surprised that Franklins are popular though, the Elmer Fudd coins actually sell...

I know a number of Canadians that are collecting the state and ATB Quarters, so I would think that these sets are near the top because of their relative ease in completing. Although most people look through change or rolls to complete these so dealers would not see the popularity from sales. I liked collecting the Presidential dollars as well, as there is a different pictures on each. Year/mintmark sets are fine, and I've done a lot of that, but they get a little repetitive! I'm starting to collect Morgans, but I'm looking for coins that have different toning to them so that each, or at least most, have their own character besides a different date.

Slabbed Morgan's and slabbed type silver coins. I am learning to grade raw by studying the slabs. I also like the early colonials but very expensive in Better grades

Just getting back from a coin show today- I say Morgan's are the most popular. I don't collect them but they are everywhere and they go really high. Stunning coins to look at really, plus all the VAMs. If the entire coin industry died, Morgan's would live on, plus they have the silver content that makes them stackable.

Lincolns have the heart of the modern collector because they always have been around.

Bust halves seem to elicit the most passion, though the Seated Liberty coinage has it's enthusiasts.

Of course, early copper has its proponents as well...

Then again, Barber halves, as boring as they may seem at first glance, are truly intriguing having traveled so many miles.

Buffaloes, when all things come together, are one of the best coins to ever behold.

They are all popular at certain times and with certain people - it just depends on who you are talking to and when.

To answer the OP question, we need to hear from dealers based on volume.