Some very good points in there but I feel as though you may have polarised the 95% debate yourself. I earn nowhere near £80,000 but at the moment I am comfortable. However, I can see the way society is going and understand it is going to take some investment to fix this. The IFS have said even the Tory manifesto doesn't have enough money for their pledges so I don't expect society is going to improve any time soon.
I'm voting Labour (and expect some tax increase in one way or another) to reduce crime, have the NHS there if I need it and improve education and just about everything else you see outside your front door.
I imagine Tory supporters don't enjoy the way society is/ is going but I don't see how you can complain if you vote to continue it for the sake of a small (in most cases) amount of extra money in your pocket.