OK, so think about how much we bitch and complain about how much it costs to fly the POTUS around on AirForce 1 and how much we spend on Congress and all that. I mean, Gov't is pretty damned expensive even before they actually start spending our money on policy.
Now, imagine if, still stuck in this recession, we were subsidizing a freaking royal family that really does cuff-all and wasn't even put in place by us to begin with. That centuries ago, a specific number of families were just deined to be such and that was that. And, for the rest of time, we'd just let them live in palaces amongst us, even after we adopted an actual government to actually run the place, making them basically obsolete.
Dude, that crap would get old fast.
And, yes, I do understand that we sort of have defacto royalty in the states. Families who own big chunks of the place and all that. But it's not really the same thing. Because every country has that. It's just that some also have this silliness on top of it.