Product placement

In reading some of my Amazon reviews (I know I shouldn't, but they're still very good), I noticed that two people commented on the specificity to which I wrote about certain brand names in SOMETHING MISSING, wondering if I received money from the companies mentioned as a form of product placement.

Certainly a fascinating idea, and one that I wouldn't mind pursuing in the future, but the reason behind my specificity is two-fold:

Martin, the protagonist in SOMETHING MISSING, is more detail-orien