Tis the season for gift-giving marketing campaigns. Online subscription marketers may have an advantage over their print competitors because consumers have been trained over the years that a new print magazine subscription can take up to 6 weeks to get going.By December, it's too late to promote gifts that will get there in time. A virtual subscription may be tougher to wrap and put under a tree (although you could solve that by offering to send a printed card to recipients, or even a decorative...