In what way does the monarchy benefit the UK?

I not an anti-monarcharist, but i dont think the majority of the pro-monarchy folk actually know why the monarchy benefits the UK nowadays besides holding on to a delusion that 'the queen personifies british-ness' (i fail to see how one person personifies britishness, but...) and other 'patriotic' attributes that they seem to conjure up to justify the presence of the monarchy