I have to disagree.
Names sell EVERYTHING. It's a facet of marketing and consumer psychology. It is said that celebrity endorsements are likely to be effective no matter who the celebrity is when products are cheap or simple. Which is why you see TV adverts (well not me personally, I don't have a TV) all the time with celebrities in them. Celebrities however, should know the product or field if it is an expensive or complicated product or they need to explain it.
It's loosely tied to the "Elaboration likelihood model".
https://en.wikipedia.org/wiki/Elaboration_likelihood_model#In_advertising_communications
So they created that Bishop speech thing with Gary Oldman - and at the end it had all those actors names on it. If someone watched that and saw a name or names they recognised - knew that they liked other things they have been associated with, it can lead to a sale. It's pretty simple.
To me this just seems like common sense though. It's all around us everyday.
So I'm somewhat in agreement with Orlando - it will sell copies. I disagree on how many. If I had to pull a figure out of my behind, I'd say it might sell 0.1-0.5% more than it would without the names. I'm being generous.
HOWEVER I would also say, the cost of contracting them would offset any gains made.