I wouldn't reuse it after a couple of days, but in the same day or so, fine.
I once made a HUGE batch of chicken noodle soup, years ago, using chicken broth left over from the crock pot. For about a week, the soup tasted fine...then suddenly, it went sour. I guess the "juice" just wasn't good, and I should not have made that much soup!
I also make my own tomato sauce, and when it comes time to need more I will make more, and add any leftovers from the week before into the mix. I figure it's a week old, right? Well once I was eating tomato sauce and found ground beef in it. I had not used ground beef for 6 weeks... No longer do I mix it in together to "save" it, haha.
I don't think it's disgusting to reuse juice, I would just keep it within the same day or so. If it gets the point where you are storing fatty juices in the fridge for days to reuse, I don't think that would be very safe.
Stumbled into Primal due to food allergies, and subsequent elimination of non-primal foods.
Start Gluten-Free/Soy-Free: December 2012; start weight 158lbs, Ladies size 6
Start Primal: March 2013, start weight 150lbs, Ladies size 6
Current: 132lbs, Ladies size 2
26lbs lost since cutting the crap.