@tjamaoe as i mentioned upthread, dont actually know anyone who pays the £8k full whack.
my DH's ex colleague used to commute to London from Reading (over £5k), his girlfriend worked in a Reading hospital. They shared a car and she dropped him off at the station everyday. If she had Pilates in the evening, he would walk the 1.3 miles home.
a colleague who lived in Hitchin had a wfh husband. I have another colleague with 2 kids who bought a beautiful new build house with 4 bedrooms in Milton Keynes, her husband works in IT and also wfh (previously worked in Hatfield). I knew a guy who commuted from Hampshire but he was abroad a lot, so didn't need a season ticket but he said it was manageable as his wife was a housewife. A colleague who commutes from Hemel Hempstead has a wife who works locally.
there are an incredible number of people who can wfh or whose jobs are not tied to London. It is quite common for people to have a spouse like that and once your spouse works in such a field, the HC is open to you even if you work in London all your life. Teachers, doctors, nurses do not need to work in London.the 4k a month season ticket is equivalent to what my DH and I spend every year commuting from Z3 to Z1 (£162 for each of us) so a couple can easily afford 1 person's commute.
If i think about it, my company has an office in Reading so I guess if I got a job there, we could technically afford to move to Reading and upgrade. my DH would work in London and pay £539 to commute per month , its £200 more than what we are spending now but thats not a huge deal. I think people who want to move to the home counties rearrange their lives to afford the costs but if thats not possible, then you can't move.