Well I will not be mining DASH or DGB or Nicehash. I'll be mining my secret coin and I have 2KWH max of electricity free and included in my Rent. So I have no issue for ROI. And I know I can mine with these miners for at least 2 years with different algos and coins. I am a Horder.
So how much of your secret coin could you buy for $3000, or whatever price you paid for the Giant+? Yes, you can mine small coins and hope they blow up, but why do that if you can just buy the coins?
Well if noxX secret coin is onion (like in your signature) then they can't buy it at all, at least on exchanges
but that is always the question. I bought a Baikal cube 150 m/h in order to mine dash for like 65 dash @ like $8. It very quickly went up to $100 after that I was sooo pissed, never to see a ROI on it (however i have definitely mined > $500 of dash with it since if you just look at it in fiat). When i first bought it, I was also exploring the other coins I could mine however, and i mined and discovered Stratis in the last part of it's POW stage. That ultimately led to things working out quite nicely.
What new coins will come out on one of the Algos that you might not notice otherwise? I kind of see small operation mining as a different way of diversifying and a point of discovery. That being said, if you don't have the space to deal with the noise, it's hardly worth it monetarily. Baikal does have some value because of algo switching, that is the nice thing about GPU mining isn't it? I don't GPU mine, but i was thinking of setting up a small rig, and between a multi-algo ASIC and a GPU, should be able to discover some nice projects.
Ultimately i don't know how much life POW has left really. POS and other security models are proving themselves and evolving all over the place. POW is outdated, and i imagine will only continue to exist in niche. Ultimately huge waste of resources if security can be found other ways.