Ruling means something. Even ruling poorly. You've built up an entourage. You have loyalists, even after you lose your official power. Further, many realms are monarchies, theocracies, and the like. One could argue that royals should be easier to chase out of republics or democracies, but IMHO that misses the point of a medieval-style aristocratic republic. You, as the realm, elected this person. You placed your absolute trust in them. Now you want to cut them out like a tumor? Okay, but it's going to be a real pain in the ass. That is what the royal perk is meant to signify. It is not impossible to remove a royal from the realm. It is extremely difficult, and it should be. If the request was made because someone was abusing this privilege and haranguing the realm, that's something else and we would all benefit from knowing about this. But simply suggesting that the problem is that it's very hard to remove royals misses the point, which has already been explained.
The thing is, that it IS impossible to remove a Royal from a realm. There is no way to actually remove them from your realm. The only current method that can even be attempted on them is Exile, but why should that noble leave. As Anaris stated earlier, leaving is stupid because Prestige and honor really don't mean anything in this game. A Royal cannot be removed from a realm under any circumstances.
