I don't know the reason, perhaps it was the developer unfriendliness, but the Saturn really suffered from the lack of 3rd party support. The Playstation was huge with the games which were cross-platform with PC's. Plus, SEGA never was able to move Sonic into the next platform level, as Nintendo did with Mario. However, IMO, the Saturn suffered most from the two strikes SEGA put on itself with the failures of the SegaCD and 32X. You could argue the drop of Genesis support was a later strike, but the release of a Neptune would have been a huge third strike. The legacy of that era was that by the time the Dreamcast came around, the 3rd party publishers had no faith in SEGA whatsoever.