I've only been in the hobby for a yr or so. my first tank got wet a yr ago this week. I used to maintain a spreadsheet of everything; equipment, fish, corals etc but its long been abandoned. In the last yr I've spent 20-22k across roughly 300G of water.
In that time ive traveled close to 120 days so I definitely added things for redundancy that most wouldnt but I still dont have a whole home generator due to permitting issues and Tesla wont let me have a powerwall without putting up solar panels. Either of those would be a quick 12-15k. I also have an extra bedroom thats somehow completely full of gear.