"1% to Open Source" has a nice ring to it. And that should go for not only individuals' pay, but 1% of company revenue from businesses that use open source as well.
That would be a strong selling point from a hiring standpoint. Heck if Google/Apple/Facebook donated 1% of revenue to OSS did that maybe we wouldn't need this service at all.
I love this as a job perk. Get paid while giving back.