yeh i just rented 13 rigs. less than 80 blocks to go
At current difficulty if you rent at 0.00075 BTC/MH/day for the 1000 block reward period you'll be break even if you're selling at around 1200 sat/coin. Anything above that = profit. And the difficulty will most certainly shoot up. Anyway, that said be prepared for the price to drop below 1k sat in the next few days.
it is barely profitable at current diff, if the block value would be 1k now, 40Mh/s cost you 0.03 and produce only 430(430x4 with block value 1k) 1720 x 1200 about 0.02, and this at 450 diff...now do the math for a diff of at least 1k