Dae Powell has a great lecture on how genealogists tend to develop their networking practices. It has been a few years, but I related to his comments.
Joining a local genealogical society isn't just about accessing the local records. Societies offer assistance to those just starting out and opportunities to lecture for those who are a more experienced.
Local societies provide opportunities for you to give back in other ways, too. Most take a keen interest in record preservation, digitization and indexing. Even though you may not have much interest in those local records, you likely support the truly global initiative to save our sources.
Some local societies offer associate benefits--discounted subscriptions to online services. Check it out.