Are you as stupid and ignorant as you're pretending to be?
The monarchy brings in a couple of billion in tourism income.
The 100% income tax on most of the royal family's income by itself brings in 5 times as much as the cost of the monarchy, most of which goes towards providing jobs anyway.
If the monarch was deposed, they'd have to be replaced by another head of state. That head of state would require a salary (which would probably be paid for life, so we'd soon be paying a dozen head of state salaries) and salaries for all the people they'd employ (as the queen does now). They would also need a similar security budget.
The country would lose a fortune by deposing the queen and replacing her with another head of state.
That's just the financial side. The queen works very well as a diplomat, so we'd lose that too. The queen also functions as a safeguard against extreme political tyranny. No need for that right now, but who knows what the future will bring?
Maybe you'd like a vote on it. Well, you have the monarchy to thank for having a vote, since the most important part of the modern democratic system (the Great Reform Act) was forced through parliament by a king, using royal power.
There is absolutely no advantage gained by deposing the monarchy and a great deal of disadvantage. If you want to waste your own money, fine. But you don't get to waste mine for some pointless rubbish burbling out from your own ignorance.