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I'm just being selfish as I will probably try and get a season ticket when they expand and I'm within walking distance! I've been using season tickets of friends/acquaintances for years and it suits me most of the time.
What you're saying about the local area kind of bears out based on the people I get tickets from, not entirely but often I go along with people who have a lot of resources/responsibility at work and home and it seems like they are there to escape the wife and kids and switch off for a couple of hours. There are also quite a few season ticket holders there because it's a high end sports game, they might support other teams but Chelsea is the nearest ground.
Most of the locals I know who used to be involved in supporting the club gave up going after it all went seated because of the cost/atmosphere.
Arsenal offered season tickets to locals. This was necessary as Arsenal needed cashflow to pay for their debt. The demographics of Islington are such that those who could afford seats are the red trousered lawyers and bankers who live in Barnsbury and Canonbury. Did nothing to help the atmosphere.
Chelsea face a similar demographic.