I saw some videos in my local charity shop. They wanted £1 for any 10 tapes, gives you some idea of how wanted these things are. I still have about 80 of the things.
if you have any that you want to keep check them for little white spots on top of the tape as you look through the clear plastic cover that protects the tape
This question has been asked on here before. Just bin them!
One of our local charity shops has a sign on the door saying "Please do not bring us any video tapes because we only throw them away!"