Paying for postage stamps

Why does it make me mad that there's a stamp with a Hershey's Kiss on it for Valentine's day?

I wasn't upset when there were conversation hearts on a Valentine's Day stamp.

I guess it's because there are multiple manufacturers for conversation hearts and there's only one manufacurer of Hershey's Kisses. Seems like too much of an advertisement for Kisses. Did Hershey's pay for the stamp? I hope so.

(Also, the design of the conversation heart stamp is far superior, but that's beside the point of this post.)