You know, the small things that can save you a lot of money. I’ll start:
You can get “hospital” powercables that are completely shielded for 20 bucks or so.
You can get anti vibration pucks for washing machines instead of spending 10 times that on the same product which is just labeled as “speaker pucks” instead.
Squirrel away chunks of cash in a different bank account over time. If you catch upgrade fever, add a larger chunk and move on.
Also, positioning.
Run slightly suboptimal, good enough, positioning and you get new gear. When you want new gear, optimize positioning. Woo-hoo, free upgrade.