After the OGL 3E 3pp product bloat a lot of people are wary to ever buy the non-Wotc stuff. Sadly this sentiment seems to have carried over to 4E, it may take some time until tje market regains faith in 3pp products. ( Even though some of them are very good, the prejudice is still there)
I remember the "d20 crash" back around 2003-2004, induced by the announcement and release of 3.5E D&D. At several local FLGS in town, all kinds of 3E/d20 3pp stuff ended up in the bargain bin a year later. The aftermath of all this was that the smaller FLGS stopped carrying any new d20 3pp stuff for the most part. These smaller FLGS were reluctant at first to even carry stuff like newer Dungeon Crawl Classics modules, or later the Paizo/Pathfinder adventure paths and modules. It was as if anything 3.5E with or without a d20 logo, was "tainted" with bad luck. One essentially had to make a special order for most new d20 3pp stuff.
At times I wonder how much "backfire" and sales fallout WotC received during the d20 crash and the subsequent aftermath.
Last edited: