For more commercial uses, users who have bought a certain token could also receive special offers or access to special information or forum areas.
I would expect a company to offer a token (could be viewed as a receipt/coupon) that can be redeemed for special offers if a user shares their token stating "I just bought a ____". I don't see why I would have to pay for a token and then given access.
I like the idea about paying for a token for charitable cause or die hard fans of pop stars or sports organizations....I also had an "I voted" sticker in my head while reading your comment.