I justify it bigger spends with the logic on how much i'm going to use it/value for money/longevity.
Yes the black one would be better 'value for money' as it's cheaper and really, it'd look nicer for longer.. logically black is the sensible choice.
But it's not the one that i want, i WANT the white one.
If i bought the black one, i'd be constantly thinking 'but i wish it were the white one, that one was so much nicer' and i'd end up resenting the one i have, and using it less and less.
So then it's better to buy the white one, and spend the extra for the thing i want and will bring me the most enjoyment.
Ultimately, i'm an adult, i deserve nice things that i enjoy, bought with the money i earned.
I recently bought a walking stick that was near £90.. i needed it, but it's a lot when i can get one for half that, that does the same job. But you know? That £90 will last me 2-3 years before i replace it, longer if i just replace the ferrule and not the whole stick, and i use it everywhere i go.. so really? Over those 2-3 years, its costing me 65p a week.. so buy the nice one, the one that fits your aesthetic, and be happy.. not thinking 'i could have had X'