Though Michael Vick has little to do with hip hop he has been taken up as an example of the fruits of "hip hop culture", whatever that is, and so the price drop in his memorabilia is worth considering here as a form of brand destruction:
While Vick was once considered by collectors as having some of the most-sought after memorabilia, the value of his autographs, cards and other collectibles have dramatically dipped, Hackler said. Even his 2001 SP Authentic rookie card, once valued at more than $1,000, is now being traded at $285 to $400, he said.

As you’ve probably heard, some chewed up versions have done very well:
The eBay auction for 22 Vick football cards, chewed up and slobbered on by two Missouri dogs, ended Wednesday as the winning bidder dished out $7,400 – with the money expected to be donated to the Humane Society.

So much for "all publicity is good publicity".