In order to resell a mining farm, you first need to own that mining farm and in order to own that, you would need to have bought that farm from someone. Seems ideal and if someone is really renting out their farm then this work out nicely.

But in reality this is not the case. In the name of "Cloud mining" what exists are MLM/HYIP programs that use new investors money to pay off old investors like a ponzi and keep running this with no mining actually happening in the background.

If you have real contacts then you might be able to set up a legitimate business. However dont look for cloud mining online because they are all scams. Even Genesis mining which was considered the only legit one is facing a lot of questions.