We all know "frequent flyers" programs. You travel and accumulate points that you can redeem as money to buy other tickets or to buy items in the airline shop. 

I found "frequent donors" program only for blood donations, like this in Virginia. In exchange of a blood donation, the donors get points that can be redeemed for getting some gadgets. 

The idea of redeeming points for some reward is very interesting, but does just "gadgets" get enough motivation to become frequent donors as it does in the case of "frequent flyers" programs?

What do you think a reward for charity donors should be?

Crowdrise is one of the several donation-based platforms that allow people to get support for causes and for-benefit projects.
It seems to be a very effective way to spread word about good actions and support them. 
Reward for supporting the projects is receiving a public "Thank you" and being mentioned in a leader-board in the project's page.
  

The question is: is a simple "Thank you" enough to motivate people in donating? Can we give more than that? What do you think?