I ditched a 2400w heater that was heating my house for my pc’s and rig which use 2100w in total and bring money in so I thinking about where you live and if you can make use of your rigs heat before investing is a great idea. I get smaller power bills, that is split between the household and everyone is warmer than usual.
TDP vs efficiency is great but if you have faith in the market or know a coin will drop within a few days then sometimes you may want to increase your TDP to get what you can get while you can, also don’t sacrifice it for stability, your miner should run for as long as possible without a crash, I manually restart my miner.bat once every 2-3 days but not because it has crashed.
Good air flow and a large room with good ventilation is the best place for your miner, on my fan cards they don’t reach 55 degrees Celsius with fans front and back for air flow as well as above for cool air intake.
I used to use the same logic you go by Trog but in todays market you have to ask yourself if you’re pumping and dumping or investing. What are you investing also? Just the cost of your mining rig or are you willing to pay for extra power to get extra coins into your wallets.
Not saying you are wrong at all, you just have to think about every aspect. Unfortunately crypto mining isn’t that simple.