Well… Making a daily profit against what you spend on electricity is generally easy depending on what you pay per KWH. My rates are rather high, $0.135/KWH.
Most of my hardware has broken even long ago, but the major cost is buying all the hardware. That said, you don’t need a ton of GPUs, you can start with just one or two. Today’s prices are not bad for hardware but the breakeven on the hardware is still about a year.
There is a lot going on in the crypto game these days with ASIC miners taking on new algorithms. For example, I bought a Z9 Mini which I overclock and get 16000 Sols/S. That is like 20 1080ti cards worth. Only cost $2100, will breakeven in 15-20 days.
I have ST doing the monitors of my rigs. If any of them fails or one of the gpus fails… ST will restart the miner for me without me having to do a thing. Basically runs itself. I just clean them every 4 months.
With a large setup like mine, power and heat become major issues. 2x 30A 240V circuits, PDUs… using 4500-6000 watts continuously depending on the coin I’m mining.
The key to heat is removing it, not cooling it. I have a room dedicated to mining at my house. I turn over the air in the room about every 90 seconds. Outside air in, heated air out. Normally the hot side of the room is 7-8F hotter than the cool side. In the winter I adjust the air movement and turn the air over every 10 minutes. My rigs basically heat my house when I do that.
All this said, today isn’t the best time to take a huge risk on mining, but starting small is fun.