Most of the product shipped to all retailers in the 1980s? Are you quite sure that's what you mean to say?
Through the 80s and 90s, yes. Go look at most of your old AD&D books and you'll find that they bear the Random House mark.
Random House was printing and distributing most of TSR's books by that point in time, not TSR. Here's a quote attributed to Gary from the Acaeum:
"It was no problem finding a printer that could do a stitched binding and school-book cover material, as I wanted the AD&D volumes to be as nearly indestructible as could be managed. Later on the Blumes changed that to save a nickel or two on each copy printed... as if we weren't making enough as it was. Crown Books wanted me to write a special introductory game book exclusively for them, but that was a no-go. Simon & Schuster contacted me about book trade distribution, but they were going to take a year to set it up, so I wasn't too thrilled. Then I got a phone call from Mildred Marmur, then the VP of Sub-Rights Licensing at Random House. They flew me out to NYC the next week and were ready to begin distribution in a month's time. As the remainder of the deal I negotiated assured TSR cash flow and other great benefits, I signed my name up there in their offices on the second day of our meetings. Having Millie as an advocate was a lot of help in cutting a great deal for TSR. Both of her sons were D&Ders!"
There came a point where they (i.e., Random House) declined to print or distribute any more books for TSR until TSR made good on their past debt owed, which (as already mentioned) numbered in the millions. Now, please note that I used the word
ALLEGEDLY in the post that you cite. Try to keep that in mind when you read on. I've seen it
alleged that the primary source of the debt owed Random House was due to returned or unsold stock.
Now, I don't know how much truth there is to that but, if you read
this article by Ryan Dancey, you'll see that he mentions WotC inheriting an entire
warehouse full of unsold TSR product when they acquired the company. It lends some weight to the allegations. Specifically of note are questions like:
Ryan Dancey said:
Why did I still have stacks and stacks of 1st edition rulebooks in the warehouse?
Ryan Dancey said:
I toured a warehouse packed from floor to 50 foot ceiling with products valued as though they would soon be sold to a distributor with production stamps stretching back to the late 1980s.
Now, I guess if you simply dismiss Dancey as a liar, yes, it's easy to believe that D&D sold better than ever in the 1980s and 1990s, but if what he says is true (and there's no reason to believe that it isn't, so far as I can tell), then this simply wasn't the case. This topic (the Random House distribution and its ultimate role in TSR's demise) has been discussed at length elsewhere, unfortunately, the publisher is so well known as to have made a general Google search useless. If you have a Supporter account here or at RPGNet, you should be able to turn up those discussions (some with input from Gary). You may also want to check the Acaeum or
Tome of Treasures.