I fully understand where you are coming from, Shiny, and in many respects, I agree with you.
But having a non elected, non political head of state has almost certainly ensured that GB/UK has had stable government for the last few hundred years and , even though we can all find fault with our country and it's governments, the system we have has ensured a very stable lifestyle for all of us.
So while I am not a royalist, I can acknowledge that we have a very stable type of government because of the non political role performed by the monarch.
Here is a fact that illustrates how stable we have been for around 1,000 years. When William the Conqueror had settled in to being king of England and had decided on which land he wanted as his own, he bestowed upon about 150 of his most trusted knights and their families, land and titles that ensured they would firstly continue to support him, but secondly would mean that they had little reason to be unhappy with him.
Over 1,000 years later, these families are still among the wealthiest in our country. Find a landed gentry with a country pile and you will find an anglicised French name. Beaufort, Beaulieu, de Montfort are examples. And the Duke of Norfolk with Arundel castle is and has been the hereditary Earl Marshall of England for a thousand years and the highest ranked duke of the country. The Earl Marshall is the person who organises the coronation of a monarch. Can't get much more important than that eh?
The very rich know how to safeguard their lofty positions through thick and thin.
They continue to get richer even in times of financial problems where us plebs get hit for six, time and time again.
End of rant!