I've just worked out that I've paid a little over £650k in PAYE & NI since I started (at today's rates).
A pension pot of £300,000 will generate £12k (state pension) assuming an average interest rate of 4%.
So that leaves £350k of my contributions to pay for my education, NHS costs for my one birth and my one short treatment for cancer. Plus childhood dentristry, my use of the roads, street lights, libraries, defence etc.
Of course that doesn't include the council tax I have paid for 38 years, or the taxes on alcohol, insurance, petrol, or VAT on almost everything I've bought, ever.
I'm still happy to only get out what I've put in if that's the system everyone wants. It does seem rather selfish though.