I do not agree with this Phil, you are refering to a different period of time and generation. Back when TSR did the studies movies also never pushed or told who directed it because everyone just focused on the actor. Now, the director has a larger then life factor on things. I think the samething can be said about the current generation, then you add into the fact that we communicate on a mass scale in seconds, not days or weeks.
Another key factor in all this, during the TSR days OGL did not exist and your only fix for D&D products was TSR (In most cases, we know about Mayfair and JG). So when you own most of the market for related material towards your product line, of course sales will be constant.
hehe..Opinions right?