Not only our time but the huge risk we take on. I have a fair amount of experience with a phantom (though I never actually owned one). Every so often, it would just crash. Something weird would happen and it would go down. If that type of thing happens with the inspire its not going to be cheap. That needs to factor into what we change.
Ive worked as an assistant camera on a couple reality TV shows so I'm basing my pricing according to what I've seen. Usually, I get about 200 bucks a day for my 5D kit rental (5DII, 70-200, 35, 50) to bring as a back up if the DP asks for it. MSRP of around 6k. The inspire set up properly for film (dual remote (even though not every job would require 2 ops), 5 or so batteries, couple chargers, iPad, pelican) is around 5K. I think you could very easily make a case for at least 300 bucks a day as a rental fee. I know DPs on some reality shows getting about 800 a day as their rate (not including kit). I was getting 250-500 a day. I would say that a drone op would fall somewhere between the two.