I think a better question is: would you consider taking a free call once per month for a charity leader who could not otherwise afford to speak with you?

Clarity could make a huge impact on the nation's +1 million registered charities by providing such a program.

Clarity already allows doing calls for charity, and also allows doing free calls. I've done some of each in the past when my schedule has allowed it. I also already have automatic donations set up through my credit card, to send donations to charities each month. That sort of already accomplishes what you're suggesting, so I don't think I'd use the kind of service you're suggesting.

Be careful not to invent what already exists. Clarity.fm already offers this.

Probably not, if I'm being totally honest.

But I must say, it's a good idea to use Clarity for market research and idea validation!

Maybe I'll add it to my list:
http://www.startuprevival.com/7-ways-to-validate-your-idea/

I would create a market research survey and send it around to professionals you know. Clarity users may not be the right audience for this idea, but there may be another audience that would be interested in the concept.