Inviting People... from LEGO

Remembering one more time, I work (or study, if you preffer) in an University. We, every year, organize a conference for our computer-science students, where different subjects discussed.

As I am a LEGO fan, and I know of the NXT brick, the future mindstorms sets, I tried to invite somebody from LEGO to talk about the visual programming language RCX (and probably NXT) use for kids.

Tried a contact though Jake McKee but the answer was: LEGO can't send anybody to your conference. I wonder why. I told we would pay trip and hotel. So, the speaker would just lose some days of work. We were offering LEGO some advertisement and they decline it.

Maybe it is my fault... why to try to invite people from the industry. Everytime I try to do that, I get a no as an answer.