If the product doesn't suck and fits well in the market, this wont be necessary. Compare that to risking the entire company's reputation, including sponsorship, by going about it the wrong way. Anyhow, there are plenty of kids out there who will do reviews for free headphones, which is considerably less dubious.
I have entertained the question seriously and asked Jude (on the phone) and he said Sennheiser has been around too long and knows better than to contemplate something like that and Rosmadi wouldn't be dishonest in that way. What anode said too. I might take the suggestion more seriously if it were the HD25s or something else further down the range, but Jude likes those and people know it.