Parmandur
Book-Friend, he/him
Based on the numbers Ben Riggs shared a while back, just about everything other than the core books sold way less all the time.During the 1E heyday TSR was selling over 100,000 copies of Dragon Magazine a month and had dozens (hundreds?) of adventures in print in addition to the hardcover books. Also of you look at the data, it does report a higher number of PHBs sold, but fewer of every other comparable hardcover they have numbers listed for.
I don't think 5E has nearly the volume of print copy 1E had (although online sales close this a lot I think). I was around and buying d&d in the 1980s and I know the bookstores and hobby shops certainly had more volume and more varied volume on their shelves than they do today. I remember d&d took up a third of the BDalton bookstore in our local mall. Now that was not all 1E and did include BXCMI stuff too.
100,000 magazines is one thing, but that pales in comparison to D&D Beyond user numbers that are over 10 million. 5E is way way bugger than 1E or Basic were, combined.