I'm generally incredibly cheap. I live in NYC, however I never eat out, own a minimal set of clothing etc. I spend on devices or items that I can learn from, especially computers. Money spent on computers that are fast and work is always worth it. I also always take uber black to the airport - it's fast, efficient and very low stress.

  Ironically enough, I take uber black to get on my bargain barrel Southwest airlines flight.  Also, services or upgrades that charge $20-30 to automatically assign you a decent boarding number are also totally worth it.