Interesting info, B-12! (particularly when you broke down the years as good, bad, etc).
One thing that you didn't mention that is worth bringing up: there's another reason why CDs in any genre of music do or don't sell: THE ECONOMIC STATE OF THE COUNTRY IN GENERAL. You said that 2002 was the worst sales year for independent Bay releases. The fact that this has happened during a time when America is in a recession should not be considered "just a coincidence," IMHO.
Say what you will about Clinton--the economy in America during his reign was in pretty good shape. It would follow that since the economy was decent during the '90s', it was easier for record/CD shops to take in more product--you could go into a store, and there'd be a good chance you'd find the latest Botany Boys or RBL CD. Because of this, it would further follow that it would be easier for a teenager to learn that a San Quinn, Mac Mall, Lowdown or Celly Cel (just to name a few) existed.
I've seen this as a fan--from '93/'94 up to about late 2000 (during the recount between Bush and Gore), I could go to Sam Goody or FYE (formely Camelot Music) and find, for instance, JT's "Something Crucial", Mac Dre's "Rapper Gone Bad", and old Dogday CDs (11/5. Baldhead Rick, Ms. Chambers, etc.) just as easily as I could find mainstream Rap CDs (Aftermath, etc.)
Now, though, you go into FYE, and since about late 2001, they've reduced the amount of independent CDS to make more room for multiple copies of new CDs from major label artists. The mom-and-pop stores aren't as bad, but even in those places it's getting harder to special-order stuff ("it's not in our computer" became a phrase I had to endure all last year when I tried to order Black C. and Taydatay's "Prime Factorz" CD).
I mention this because I'm a little sick of posters on here crying about "why can't the Bay blow back up again..." It's true that there are too many wannabees who shouldn't be rapping, but that's everywhere--North, South, East, West AND Midwest--not just in the Bay! I do still think there is quality Bay product out there (i.e. all Done Deal stuff, Ap9/Jacka/Ridah, Yukmouth, 40 Ounce, Right Way stuff, some Get Low solo stuff, and both Vallejo and Pittsburg artists in general). But the economic state of the entire country is a very important reason why it's so hard for independents nowadays.
In a sense, how CAN the mainstream audience be aware that, say, Done Deal is out there to enjoy when the stores don't stock their music? It would be cool to see the Bay get into a similar position that they were in during the mid-'nineties, but people here have to understand that if the economy of this country doesn't improve, it's not going to make things any easier for independents. So you may as well just enjoy Bay music because YOU like it and not worry about whether or not everyone else in America likes it (life isn't an episode of "Saved By The Bell", folks). Sorry this is so long, but I do often tend to go on when talking about music and whatnot--sue me. PEACE!