Many attendees don't care, the trip is paid for by the company. It is a nice trip to an attractive location (sunny Florida in winter, etc).
At most conferences I attended, there were scores of presenters who, frankly, sucked, or the supposedly "technical" topic turned out to be unabashed product/service pitch.
At most conferences I attended, there were scores of presenters who, frankly, sucked, or the supposedly "technical" topic turned out to be unabashed product/service pitch.