But why don't people change jobs
??

I can live to be a trillion years old with all the knowledge in the world and I'll NEVER understand this mindset. How hard is it having your CV professionally done, using Linkedin, job sites if you're so inclined or contacting a certain company you identified as a fun/good place to work to see if they have any positions going? 
All I see is people bitching and moaning and moaning and bitching without lifting a finger to do anything about it.
I'll use myself as an example. I went to OZ/NZ on holiday 3 months ago to see my brother and visit some university mates that's earning FORTUNES out there. I got back to London, got severely depressed living in such a horrid hole of a city, got online, identified 3 companies that's in my line of work down that way and noted them down. I left work early around 3pm (this is day 1 of getting back). Got home, made coffee and sat down and wrote a short introductory email to key people I've identified in those organizations. I was done at around 5pm. Went to the gym, came back home and showered and hopped in bed early (jet lag was killing me). I got up 5am the next morning and had two emails back from those I've emailed, asking me to call them. I went to bed that night and set my alarm for 2am to get up, ready for a phone call at 3am (time differences). I 'interviewed' with both and got offered a job with both. I picked the best one for ME and said yes.
I got my work visa within two weeks. I'm leaving for NZ, February 19th.
Was that so hard? 
I just read the first part of your post.
You are obviously a very self motivated, disciplined, industrious and ambitious person. Someone like you don't understand why others don't change their, for lack of a better term, drone-like existence. I understand that.
But the fact of the matter is that many, if not most, are quite content living a fairly comfortable, risk free and routine existence. And you should be grateful for it. Very grateful. Everything you have had to be truck in from somewhere and the truck had to be driven by someone. There had to be that same person installing hundred of thousands of tires year after year so you can drive your car. Those oranges and tomatoes don't pick themselves. That seamstress that sits in that same chair for a couple of decades stitching those same stitches so that you can strut around in your Jeans has to come from somewhere.
Grunt work needs grunts. I know you can't understand it. It's not in your nature. I work a flexible schedule so I can avoid traffic but every now and then I have to get right in there and brave rush hour traffic. I look at those around me and wonder how on earth they can do it day after day, year after year. They don't seem bothered by it as I am. They just seem numb to it.
You get a job that pays the bills and you're content with that. You live during your off hours and when it's time to fill that social contract you, I don't know, you just become emotionally dead. You just go through the motions until it's time to clock out and then go back to your family and life.
Some seem to be destined and content to be the worker bees. The ones who keep our society humming along. Thank God for people who can do this. You could never do this. Be grateful to those that do. What would you do without them?