Hello, as you said, it deppends on the status of the prey: if locked prey(5 wild cards-2h, 1,5kk) or reroll prey(1 card - 10h, 1,5kk).
Having that on mind, you just need to make your profit/h be the same amount that youre wasting/h, so:
Locking prey: waste: 1,5kk/2h = 750k/h -> You should profit 750k/h to break even.
Rerolling prey: waste: 1,5kk/10h = 150k/h -> You should profit 150k/h to break even.
I think that the formula woul be:
Profit= (TcPrice*50)/(#Hours)
Remember, the number of hours is 2 when the prey is locked and 10 when the prey is rerolled.