Sirius / XM merger copycat ad of MC's signature "Priceless" campaign has been making the rounds -- the irony apparently lost on on the NAB that hiring a would-be-lobbyist for the other side and knocking off someone else's ad campaign smells very much of bad business. It's no surprise that MasterCard cried copyright infringement, which prompted the NAB to stop running the ad altogether. Michelle Lehman, the NAB's EVP of Marketing and Communications and Regulatory Affairs, confirms the cessation but also points out that the ad's already gotten a bunch of attention anyway. NAB losing its cool and cred in front of the industry? Now that's priceless.