What if the way a ghost acts differs from the actual person that is dead? Something that Ghostbur and Revivedbur have stated in the past is that those two are completely different people, that part is known and obvious, but what if that is the same with all the ghosts on the smp? Which is why Ghostboo acted completely different from Ranboo.
Here's the actual theory from the first sentence now. Whenever a ghost says that they like being a ghost and likes being "alive" the actual person doesn't want to be dead, they actually want to be alive. The ghost is once more, a separate entity, they are not the actual person. That ghost will also do whatever they can to stay alive, by doing that they talk down about the alive versions of themselves making others think that the actual person wants to stay dead as well. That is not the case though, in reality, the real person wants to be alive.
But what if the ghost wants to be revived? Well, then the actual person thinks the opposite, the real person wants to stay dead, or doesn't care about being dead or alive anymore.
Here's something that might tie into the story with this theory a little bit now, this has to mainly do with Ghostbur and Wilbur/Revivedbur. In the beginning, Ghostbur wanted to continue being a ghost, he was fine with his status. However, in the afterlife, Wilbur was having second thoughts about dying. Thinking that his death wish was all based on impulse and that it was a mistake. Overtime though, Ghostbur realized how bad the world truly was and didn't want to live anymore as a result (during Doomsday was when that decision was made). However, during that time Wilbur came to realize that what happened, happened and came to terms with that. So, when Philza tried to revive Wilbur because Ghostbur said so didn't work, it was because Wilbur wasn't ready to be alive yet and didn't want to be alive anymore.
When Tommy died however, Wilbur still didn't want to be revived, as we saw, but when Tommy was revived Wilbur saw hope again. He realized that he could get another chance. So, during the time of Tommy planning to kill Dream, we see that Ghostbur wants to continue being a ghost again, meaning that what happened with Tommy meant that Wilbur got newfound inspiration to be alive again.
So basically:
Ghost wants to be a ghost = Real person wanting to be alive
Ghost wants to be revived = Real person wants to be dead
Also, sorry that that was long it was just something that I thought of and theorized.