But the balance must be handled delicately to ensure that attendees who have paid are not put off by aggressive marketing. Given that the content is being created in real time, this can be challenging; a speaker may unexpectedly use the stage to promote a product, in which case he or she would probably not be invited back.
当然，许多会议都混合了这两种模式。但必须谨慎行事以确保主动营销不会吓跑付过费的与会者。鉴于会议内容往往要临场确定，要确保有限度营销确实存在一定难度；发言人可能会出人意料地利用讲台宣传某种产品，这么做可能导致他/她被从今后的邀请名单上排除。（比如专栏作家可能借此机会宣传自己或第三方所提供的内容。）