Tech conferences are incredibly expensive, and not just in dollars. Even free conferences like BarCamps incur the expense of the attendee’s time. Taking time off from work or family is a hassle at the very least, and it’s time that isn’t billable. The draw of the conference boils down to those 45 minute sessions, and speaker and attendee alike should make the most of it.Speakers often start off by wasting time. They front-load the presentation with worthless information. If you are a speaker: I don’t care what company you work for unless it’s somehow relevant...