If you’re in the audience at a scientific conference, what do you really want? For me, that’s quite simple: understanding the papers that seem relevant to me. So as a speaker, focus not on what you want, but what the audience wants. Your personal goal is to get your message across to those researchers for whom it is relevant. Note in particular that attention is not a part of your goal. Sure, in order to understand a message, people will likely need to pay attention, but solely capturing (or stealing) that attention does not reach your goal. Furthermore, if people get your message without paying attention, that seems like a win–win situation. Therefore, instead of focusing on getting attention, focus on maximizing the use of the attention you get.
Remarques intéressantes sur l’attention et la clôture d’une intervention.