At difficulty 120 - a 1000 Mh/s will mine about 2500 MAL a day. Renting a rig costs about 0,25 BTC/1000 Mh/s . Added up = mining cost on diff 120 for MAL i 10 000 satoshi. Miners want to make a profit, so 10 000 is not really a high number right now.
That works if all around rent hash. Lots of miners still using own rigs and/or buckshee electricity etc.