Donating money to charity

I received a phone call from a person who works for a large charity and wanted some help with their tele-marketing script.

Personally, I have trouble with giving money to a charity where a significant portion is used to pay the collector.

For instance, If I donate $20 based on a phone call, and the telemarketer is paid $17 per hour, and only makes 1 sale an hour, then the charity isn't getting much out of it. By the time other overheads are taken into account, the charity is making even less.

I would've thought that there would be enough goodwill to do some smarter marketing, especially through corporate sponsors.

Imagine a corporate that offers some of their telemarketing capability to get donations for a charity, & then donates all of that money to the charity.