@manu92, same valid thoughts, but quite tricky. There is no way to get a cheaper price on energy in the country I'm living in, and I have no interest in any cloud mining scum, so it's miners in my possession or not at all.
It's true that ROI calculation does not honor the fact that the miners and PSUs can still be solded at a price after having to give up on them, so it may not be that black and white after all.
Starting a large scale mining operation is out of question for me, because with what I have/had in mind I'd not have access to a power plant providing that much energy, and I did not want to put in that much money as well.
I have some hopes now for the shortly to be announced S4 and L1, so it may not be completely over after all. If only Spondoolies-Tech would speed up with the next generation of miners (= SP50?) instead of trying to optimize current tech (= SP31), but we'll see. I'm nevertheless quite impressed by Spondoolies-Tech company, so I'll keep a close eye on what they are doing.
Right now I can see more sense in just trading BTC.