This is great marketing. Tie in your promo to the highly-popular, highly-dubious event as an advertising tie-in to multiply its effectiveness -- as a fringe story involving the event, you're going to have your message repeated automatically by others interested in the event.

You guys just reminded me that a Visio competitor exists, and you got me to try it. You did this by using a marketing message which entertained me -- don't buy now because "tomorrow's doomsday". You gave me some entertainment value in exchange for taking my valuable time. Thanks.