Today I was at APIIT to do a presentation about the XBox 360, so I went through what I did previously at MIND. Which was after a brief show of gameplay, I'd talk about other features of the 360. Friends list, downloadable content, various features of micro transactions, etc. etc. I noticed that the audience really didn't like it when I was talking about other things, there felt like an audible groan when they heard about stuff that cost money. They realy didn't seem to care much about the mechanics or business of selling micro transactions online.
They did however express a lot of attention and enthusiasm when I was playing trailers, game demos, etc. etc. I reflected on this issue when I got back home and realised... they are mostly full time students still studying and such, of course they wouldn't be that interested in the business side of things since it doesn't affect them yet. So I should have just shown lots and lots of games... and trailers.
Know your audience.. choose the right content!