How many times have you been at a conference, or speaking at one, and the topic turns to their/your latest ebook or plugin. What happens? Everyone looks down at their gadget and buys the ebook or plugin or groovy thing while the speaker is still talking. If that conference is an international one – as the vast majority of web conferences are – the speaker is going to regret having mentioned it at all, because they’ll spend their travel time back home staring at a spreadsheet trying to determine the place of supply of their audience members.