That not all writers want to network, and this most definitely does not make them dumb. Some people just write because they like it.
Thanks to the internet we have E.L James being one of the most well paid writers-- and I think we can all agree that she is far from even being remotely good... But, she is very good at this networking game.
TLDR; being good at marketing your work on the internet will only lead to temporary (monetary) success but is in no way an indication of quality of work.