The traditions of respect for our monarchy, the traditions of all the pomp and pageantry that draws in many, many thousand, if not millions, of visitors each year which brings in revenue to the tune of around £30 billion pounds into our economy. Add to this the respect that people around the world actually have for this country BECAUSE it is one of the few remaining which have a monarchy. There are probably a lot more reasons why people love the monarchy which I can't think of at the moment.
As I said in an earlier post, each to there own. I respect your opinion if you don't agree/like our monarchy. Hopefully others will respect mine when I say I do like and respect them.