Crowdfunding: Connecting Creators and Patrons

These are the standard incentives as of now for my one card draw:
If total tips exceed $25, I will select from all sponsors to receive a free Wings reading. At $50, a random sponsor will receive a Simple Nest reading. At $75, everyone gets into the running to win a Wings read, and at $100, everyone gets a chance at a Simple Nest.
Can't afford to donate? Spread the word! Post a link to my draw in at least two different places and you can request a second card! (You may treat it as a separate request or use it to get further information about your first reading!)

How do you feel about these incentives? Would you like me to change it up? How? Any suggestions for alternate/special incentives you'd like to see?

Thanks for your opinions!