It's been just a general observation. Perhaps it also depends on a person's viewing habits as well, but I'd say that particularly in the case of TV product endorsements and network shows, bias certainly exists. Then again, with LSBM's being such a small portion of the existing black / AA demographic, people just simply may not notice. Unless something is said about it, it stays under the radar.
Oddly enough, the industry casting authorities who collaborate with advertisers, may well themselves be AA's who want to make a point as opposed to traditional white (or non-black) professionals who have an inherent bias. Mind you, over the past several decades, light skin in the black community has somehow been recast as a much darker complexion than it used to be, in many cases because of blacks who wanted to pass above 'that' color line - e.g., inclusion. So, pointing out light complexioned men who have been overlooked might require a clarification of what light complexioned really means within the AA community.