I want to answer the other poster who shows up dead: how can you lend a miner? Like lending a little heater. Like lending a cow, one guy needs milk the other wants the meat and hide. So if you already have all the electrical heat you really need for your house but want to mine more, you won't benefit from more heat for your own house. Whereas maybe across the street a neighbor is still using little electrical heaters a lot, doesn't understand crypto very well. So they work something out, the neighbor gets heat, pays the electric bill, and gets a cut of the mining, and the original miner provides the GPU through his contacts and gets a share too. So that way the heat doesn't go to waste, and the miner can scale.
Clarifying for alisonkisk, lend means 20 cards instead of 10 you need for heating, lending the other 10 out to a neighbor for his heating. Economies of scale, for instance by buying more cards at a time at a better unit price.
