The PC-Enthusiast market isn't the largest, nor is it any longer the niche community it once was. The rapid growth of the Enthusiast sector is largely due to the Gaming industry. Gamers probably spend more money on "PCs'" or PC-amalgams (X-Box GPU) then any other segment. Business is Business but the business of playing games is huge. While video cards are catching up to some systems in their memory compliment (512MB) RAM is still a necessary and fundamental aspect of your system.
Read here