Those earning over £80K p.a. have an incentive to pay extra tax to fund schools, hospitals, fire stations and so on. A well educated population benefits everyone, including business leaders, because it means a better standard of literary and numeracy within the workforce.
I hear a number of senior managers who regularly bemoan the fact that they cannot recruit good quality candidates, and that literacy skills are falling. Paying extra tax to fund a good quality state education system would solve this issue.
The very wealthy will continue to pay for private education and healthcare, but they still rely on the council to fix the roads upon which they drive. They don't operate their own police forces and fire brigades. Just because they don't use some of the state, doesn't mean they are completely removed from it as service users.
Ultimately there is something morally repugnant about a system where an adult can be in full time paid employment and still not have enough money to pay their basic living expenses. Firms like Walmart and Amazon are dependent upon the welfare state, because it enables them to keep their wages low and maximise profits for their shareholders.