I am not estimating, we have the bookscan data and the other TSE data through 1999
According to the bookscan data (as of 2023) and TSR sales through 1999 poster earlier:
5EPHB: 1.6M - 1EPHB: 1.6M
5EDMG: 800k - 1EDMG: 1.3M
5EMM: 800k - 1EMM: 1.1M
5E Starter+Essentials: 1.6M - 1E Basic (all versions): 3M
5E total top 15 on Bookscan: 6M (includes DM screen and cookbook)
5E total top 15 on Bookscan plus all adventure sales: <8M
Total reported for 1E: 10M we know of and is missing many major hardcover publications and all adventures
By about 500,000 copies according to the data posted on this thread.
Except most of those 20 did not sell 100,000 for 5E. Only 4 of the 20 adventures for 5E sold over 100k copies (COS, WDH, TYP and HODQ). The average is more like 60k and 70*20k is in fact more than 20*60k
And I also think it is more than 20k on average for the 1E modules. I don't know what the number is for 1E modules, but I haven't seen you post numbers either. But I do know that the 5E adventures average around 60k each (as of 2023)
It is above.
Now how about you provide some math and numbers!