What I want to see marketed is Harry's favorite drink, butterbeer. That is subversive of the basic psychology of marketing any useless product. Harry Potter tells the kids they are okay without buying anything. Which is a repressive schema completely counter to the Potter paradigm. This is why your news note is actually important, not just the kind of marshmallow mind goo that it seems to be, sandwiched between Temptation Island and Oscar twaddle.
Product placement is visual pollution.
It's arguable how big a deal this is, but it does dilute and confuse the artistic content of the movie. The money allows producers to make a fancier film for the same ticketprice. Regular pollution is like this. But everyone whined about the pollution, so they don't do it anymore, and the cost of them not doing it anymore comes out in the cost of paint. So, if it bugs you, bitch to the movie companies.