The title might be confusing but if you take a deep study on mining activities and the factors that directly affect the amount of crypto currency mined such as hardwares and the likes, factors as low as the temperature and high as electricity rate. One will really see the need especially for investors, not to fully buy into fast investment, for the farm is liable to change with time. For example, cases of the once effect bitman hardware reaching dotage unexpectedly. But, follow meticulously the last paragraph.
So make your research effectively, and ask alot of questions before jumping into a pit of loss. Also, pray for direction.
P.S: a rig farm is a place where hardwares and software meet to mine crypto currency such as either bitcoin, litcoin or Ethereum. Or even all of 'em.