Chris may have missed what may be the most probable reason. Integrated graphics onboard the CPU's eviscerated the sales of "low end graphics cards" to the poin

Chris may have missed what may be the most probable reason. Integrated graphics onboard the CPU's eviscerated the sales of "low end graphics cards" to the point that few to no makers are building and selling "low end cards" because there simply is no market left for basic graphics cards. For the user that is satisfied with their integrated graphics, they have no reason at all to buy a separate card, and for the users who do want a separate card, most want the high power GPU cards, not a card that is little more than the onboard GPU but on a plug in card. It is the same reason why parallel/serial I/O cards disappeared (when most motherboards began integrating onboard parallel/serial ports, sales of standalone cards would have collapsed) or sound cards (same reason, if onboard is "good enough", no additional sale of a separate card occurs).