As to the forum of the ad; call me stereotypical, but most people that buy products from infomercials are not consumers of the type that search for information about products, instead they prefer to sit in their couch and digest whatever the merchandise presenter says, why the impact of this ad is likely to be rather small. Has paypal ever had tv commercials? I have not seen any, although I do not watch that much TV. TV is probably not a good marketing forum at any stage of Bitcoin, in a cost/benefit sense. Of course, "the only bad exposure is no exposure" or something like that, so I do not see that the ad will have a negative impact; almost all viewers who may think that Bitcoin is a scam are very likely to forget about Bitcoin in a very short time span.