L.O.
This might not work, but its a suggestion. Maybe the Hershey's kiss just doesn't seem that rewarding. With my kids, I made a chart, and when they filled the chart, they got something they were "really" dying for - like a Barbie ($5 kind), a Beanie Baby, a Webkinz, etc.. At first, the chart only had 3 blocks to fill out. As soon as they saw what a great reward they could get, they were all for trying. After the first chart was done, the next chart had 4 blocks, then 8 blocks - it quickly moved to about 14 blocks, then finally 21 blocks. Seems expensive at first - until you realize how much you spend on pull-ups! This reward system was way cheaper, and after they were used to using the potty, I finally told them they didn't need rewards any more, they were all grown up.