The 7800 had 59 games released for it, so for most it's an irrelevant console. Being able to play 2600 games is nice, but not worth the $100 or so someone would charge you for the system. From a value perspective, the NES is a much better bang for your buck as it has a monster library of great games that have tons of replay value while the 2600 is an arcade machine with quaint single serving experiences.