I don't get why people would sell (a part of) their hashrate. Why not use it yourself? I know it's faster cash, but still... It sounds strange.
because it's a small amount of time, and you'll earn more of fast cash. Every miner needs at least to cover electricity bills, so why not by renting their hashrate for 2 days. for 1.5 or 2 times what they could have mined in ltc for bitcoins.
As i said.. just asking, you are maybe right and no one will ever rent me anything ^^