I don't think I would have offered to sell it or accepted an offer to buy it, but I think I could have easily been talked into sharing it, in a "I think my boss is a cool guy and I want him to like me and/or impress him" situation.

I'm not doing anything wrong! It's not like I'm selling it! I'm just showing off the cool data no one else has! I'm saving the day, probably, by letting us solve a problem with my cool data that would be impossible otherwise.