All I can say is, it?s Shonen Jump. Look at other titles that were released in the past, hit a HUGE popularity rating, and decide to continue it for the sake of continuing.
For example, you have Dragon Testicles. That series was originally supposed to end after the Freeza saga on Namik. Then they brought on the Cell Saga, and it was supposed to end there. Then they brought on the Buu Saga. And they REALLY wanted to end it there. But alas, someone took over the story writing, and came out with a pile of repetitive crap known as Dragon Testicles GT. They started with finding some way to nerf the biggest tank in Dragon Testicles, which is Goku. Then make up some clever antagonist that can cause everyone to wiz in their pants. (Though I?ll admit, the Baby saga was clever.) It just got to a point where we know how its going to end. The villain gets ridiculously powerful, the protagonists look awfully weak, then all of a sudden, they pull some super-power-hyper-oh my god I am now godly-bull crap out of the clear blue?just like when Goku punched Broly and that is the end of that.
Another example?is Naratu Sand Ninjas. Come on people, we all know this was coming. Yes, I give kudos to this anime for having a good story, and interesting characters. The problem is though, is that none of these characters are NINJAS. Ninjas are supposed to be silent assassins that rely heavily on stealth to take down their opponent without warning. These so called ?ninjas? are the total opposite. Constantly screaming, doing long hand Justus that allow them to cast SPELLS, and chant these magical words to perform the same thing. Not to mention, their choice of clothing isn?t very ninja friendly either?since when does a ninja run around in an orange jump suit, yelling at any giving moment? That is like playing Metal Gear Solid while carrying around a boom box that blares drum and bass all the time. Shoot, if there was ANY character on that show who is closest to a ninja?it?s Rock Lee. He doesn?t cast spells, doesn?t do any of the hand bull crap, and relies on his speed to get things done. With that said, Naratu Sand Ninjas is DBZ with Ninjas, or spell casters on crack.
And Detergent is pretty much the same thing as those two listed above. Only instead of going for a good storyline, fisting each other to death, or yelling like they have to take the biggest dump in the universe, they went for swords with some of the weirdest designs, boobies, and take on a ghost busters theme. Detergent WAS fun to watch if you skip all the dumb fillers, until they decided to pull another DBZ effect, and make up more needless episodes that will likely butcher the anime to the point where its not even fun to watch it anymore?its safe to say that this anime is a cash cow.