I have a lot of people that want to invest in mining rigs in my city, over 20 people.
I am looking for someone that has lots of experience in mining, that can help me with the parts and everything.
Would this also be profitable for the clients? Since ETH will be turning to POS and mining might not be as profitable.
Here's the thing, how are your morals/ethics? You can build these rigs and people will buy them because they want their "slice of the pie". Some of them may become jaded after awhile especially if they see they are hardly making their money back over the next 6 months.
I dunno, just make sure you let them know that this is a very volatile thing and that no success can be guaranteed.
I'd use 1060s and 1070s before they too get gone. RX cards are a very bad choice at this time. They are NOT future proof in either 4 or 8 gg capacity. Nvidia cards are future proof provided you buy 6GB 1060s