Ive never reused before only because I very rarely deep fry a turkey but can really see why folks do. I have some friends that do the same thing as your bud.
I look at it like this.. In any resturant you eat at that fries any of their food usually does not use fresh oil each time.. Back when I was a young whipper snapper at Taco Bell I had to fry all the shells, cinnamon twists for that day. I never once cleaned out the grease. I just added more when it got low. And that machine I used would be heated up for about 2 hours in the morning and then just sat there until the next morning until it was heated up again.
Just my thoughts but I dont think there is anything wrong with it.
I look at it like this.. In any resturant you eat at that fries any of their food usually does not use fresh oil each time.. Back when I was a young whipper snapper at Taco Bell I had to fry all the shells, cinnamon twists for that day. I never once cleaned out the grease. I just added more when it got low. And that machine I used would be heated up for about 2 hours in the morning and then just sat there until the next morning until it was heated up again.
Just my thoughts but I dont think there is anything wrong with it.