We rarely use Joker sets as we look at training as MORE than just lifting weights - things have evolved in our weight room to involve what we like to call "Fucking Awesome" style of training. So Jokers are great for a few people in a few instances but we never do them if another area of training is lacking. We have standards we set in certain areas of fitness, ones that I believe are paramount to being a better person. Strength is one of them but so are other areas.
So yeah, if you think these things help, go ahead. I don't see much reason for them.