>>369922813
Same reason why D&D gets so much love despite most of the "game" consists on talking and imagining everything.
People like adventures. They like a good story. They like roleplaying and keeping in character while going on some grand adventure. And all those memories they get to share with their group.
It's why people stress that D&D isn't about winning but having a good time.

People who want the SAO experience really just want a purpose to roleplay in and go on a big adventure.