Well, "it doesn't make sense" depending from which angle you are looking at it. If you want to rise money for some kind of a Ponzi/ICO/Whatever, than it really doesn't make any sense. But, I guess you've never heard about "commercials"? These things cost a lot more than 15 BTC - try to buy few seconds on CNN or on BBC, or on the lousiest Chanel in the world you can think of, and you will see what kind of amounts they're charging. Try to reach a whole huge worldwide community of any sort (which will require more than few seconds, every day, for months, on hundreds of tv stations all over the world), to make it talk about you and your product, and you will get a headache from the number of zeros. Plus enormous costs for the creative teams, translators, movie crews, script writers, journalists, copywriters, web designers, transportation, catering, hotels, rights, fees, costumes, city taxes all over the world. Commercials are very expensive business, and the good ones are blasphemically expensive. (What do you think Jack Nicholson or Tom Cruise, or any local movie star in Asia would charge for a 15 or 5 sec appearance? 15 BTC? ) So, if these guys are looking for a good commercial for some real project of theirs, I guess they are getting it, and at a very cheap price, if you ask me