Those people who sell their hash rate make some decent money by doing to I guess. It's a more stable stream of income than trying your luck in the mining game. It's more predictable and businesses tend to prefer that!
Not anymore, selling hash rate price is dropping badly..
Yeah because people actually start to realize that they're losing money by buying hash rate at those companies. Also, the difficutly is, again, rising a a worrying speed. So a single GH/s is worth less every day!