Here in Montreal Canada you are able to get a S3+ for 20$ an S5 for 80$ without the power supply, to run 24/7 cost 0.60 cents a day.

To run them solo is not worth it, sell it ...... maybe as a door stop since summer is around the corner. They are great space heater in the winter,
I actually saved money this years heating my basement.

Now there is a lot of alt coin out there and I was successful whit Peercoin until it fork lately and not all the nodes updates, I tried Emercoin
and got a lot of orphan blocks, those coin are made for POS not POW.

Here is my ideas, pretty sure there is a genius out there that would take one of the coins that did not start of tank and make that coin
a slow ASIC POW coin, let say that you can't mine that coin whit more then 1.5 T or you get kick out the network or temporarily ban.

The coin reward would increase whit the difficulty not the other way like all the actual coin. By doing this people will bring back they old ASIC
to work and maybe create a new rush like Bitcoin did when it got popular.

The value of that coin should be low but high enough so people would like to mine it and enjoy making a block and the reward.

So I am trowing the ball out there, hope that somebody catch it and swing it back.