The more you use a tape, the more chances for the tape to be damaged and trying to record that "oscar-winning" beautiful shot on broken tape will ruin your shot, and then NO OSCAR FOR YOU!
I try to run the tape through the camera only three times:
First time: black the tape (record from start to finish, leave the lens cap on) so I don't get any timecode breaks while I'm shooting. This also loosens the tape to prevent the tape from sticking to itself while recording (the factory winds the tapes tight so they don't get damaged in transit).
Second: Recording whatever I'm shooting.
Third time: To capture the footage onto my computer.
I then usually put the tape away and never touch it again.
I'd only reuse tape if I was in the middle of nowhere and had to get a shot that was absolutely essential. Paying a few bucks more for a new tape is always worth it if it will mean not having to worry about losing shots to damaged tape.
been making videos for 10 years. ran the edit suites at a university. Been through a lot of tape.