Not a dictator, not a murderer, not a tyrant, not a source of corruption, not a destroyer of tradition or heritage, and never unpatriotic; then why remove your monarch?
There are a million times worse persons running nations, with less much claim to their position; yet no one is bothered, nor if bothered, daring to ask for their removal.
Your monarch is not your enemy nor the harbinger of bad tidings or evil influence. There is need for severe redesign, I admit, of the structure of the monarchy. Yet, what you have has its use.
Do not admire US too much, for there is a certain danger, that it may reach a point where no one would know where the nation should head for, for everyday it is changing, and maybe in matter of 10 years time, there could be a radical change in the nature of that nation, if careful understandings are not there.
There is need to have a place to stabilise the national aims and direction; and in times to come, the need for this may be more visible.
As for the cost, compare this amount with what you give as aid to the most misguided governments of the world, for private wasting and siphoning. Yet, let the monarch be more thrifty.