Amazon existed in 2000 but so did gamestores and Amazon was a lot less prevalent. I would not bother comparing 2E and 3E Amazon sales. Yes Amazon and 2E overlapped.
Main point being gamestores barely exist now so Amazon sales would be up for that factor alone.
Worked for 1st ed. Adventure sales got very low in the mid 90s though. Sub 10k and even 5k units being sold. Dungeon magazine maybe u dercut them as well IDK. I bought very few but all the dungeons I could.
As for TftYP
It seems to be doing better then CoS did.
http://www.enworld.org/forum/showth...mber-1/page2&p=6849864&viewfull=1#post6849864
Which I think was the only other adventure to hang with the core rule books for very long (or at all). So, strongest debut for a 5E adventure yet.
EDIT: I just checked back, its at #76 and PHB is at #59.
...
I'm seeing a pattern here. We only have two examples, but since we don't have a lot of 5e adventures to compare it to, those two matter.
What do those books have in common? Nostalgia/established D&D tradition; and not a 1-15th level campaign-length adventure.
Perhaps if these keep selling WotC will find ways to shift their marketing more towards these and away from the "campaign in a hardcover" publishing technique. The tough part for them is just to figure out how to keep organized play doing what they want it to, and how to manage a strong transmedia tie-in.
The adventures thing is really interesting to me. In 3e (and the White Wolf heydey) it was received wisdom that 'player books sell to the whole group, DM books sell only to one, so the former make the real money'. I don't believe that White Wolf ever had a big focus on adventures, beyond the occasional campaign one, but you could argue that their games never suited pre-written adventures. Meanwhile, presumably WotC could look at the data, and presumably determined from that that adventures were poor sellers; yet now 5e comes around, and suddenly big adventures are the big money makers of the edition. What changed?
Is it just that, in an edition with no player crunch, adventures are king? Or is it that 5e - the rules, the edition strategy, whatever - just really suits pre-written adventures?
I loved Dungeon in the 2e era when I had a subscription. If they made a print version of that again I would subscribe in an instant. Every couple of month some interesting, generally stand alone adventures, that are just the right size (not campaign length, but not just mini adventure bites either) arriving in my mailbox for a few dollars. ....
One of the points of these threads is that so far the core books have far, far outsold the adventures.
CoS was sort of an exception, but it still faded eventually. In general, that old pattern holds.
I think its just that WotC wants to keep barriers to entry low, and a campaign in a book is an easy way to do that.