I have just registered trying to rent a rig but I do not understand what is the point of doing it at current prices.

For example:

Renting a Sha256 rig cost around BTC 0.0003 TH/Day but mining calculators show that it would only make BTC 0.00016 as much.

Can someone explain why renters are willing to pay so much? How can someone get a profit out of renting a rig at 0.0003?