Believing in socially just policies does not mean believing that individuals "aren't allowed to be rich" or spend their money on extravagances. It just means believing that the worst off in society should be helped up to a decent standard of living alongside that.
e.g. I'm much better off than I was 5 years ago, and 9 years ago I was flat out "eating buttered pasta for most meals" poor. We still (fingers crossed) get better off year-on-year and have a decent-ish disposable income. I'm not buying half million pound swimming pools, but I did, for example, spend what would be 2 months rent for some people on a PC graphics card (flexxx). It should obviously be possible to increase one's income, and enjoy it... but that doesn't mean I don't still believe in a fair or even generous benefits system for low incomes
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I mean, look at Arr Ruth in the papers today. Head of the Scottish Tories; but asking the PM to give up on cutting taxes (a Tory policy) in favour of supporting and improving the NHS (when Universal Healthcare is very much a socialist policy). All Tories should follow her example tbqfh.