"Helping underprivileged kids" is a smokescreen from the pro-voucher folks.
The Dougco voucher supporters aren't about to bring inner-city kids to their schools.
But the voucher supporters know that's an easier sell than "We want to send our kids to a ritzy school that we can't afford on our own, so we want the taxpayers to help out."
The rich don't need vouchers but will gladly take the vouchers if they're being handed out.
The middle class with aspirations would use vouchers and their own money to go to the primo schools, the ones with cachet.
The poor would be sending their kids to any school that would be willing to accept vouchers as full and complete payment. That would be the public schools and maybe a few private ones.
And to all the middle-class supporters of vouchers? The whole point of primo schools is that they are exclusive. Inviting in everyone is the opposite of exclusive. They'll raise their rates beyond what you can afford with the vouchers and remain exclusive.