Glyfair
Explorer
From my perspective, putting a name on the cover is entirely an advertising move from the publisher. If you have someone well known enough to draw people to your product, you want to advertise it (Gygax would be the prime example).
If I was someone who bought products based on whose work I like, I would certainly look at the credits. If I don't look at the credits, I probably wouldn't notice a running theme, even if the name was on the cover.
Even though I do try to notice somewhat (I'm not firmly in the camp of paying attention, although I lean that way now), it's not always clear who is responsible for the quality of the work. For example, I was very impressed with Mike Mearls' product for Atlas "In the Belly of the Beast. I liked the design and the way it had sidebars suggesting ways to customize the adventure. However, that wasn't necessarily his touch. It could have been the publishers house policy and maybe he could care less. After several products I noticed the trend was that I liked Mearls' products and found Atlas to have their ups and downs (more ups, though).
Glyfair of Glamis
If I was someone who bought products based on whose work I like, I would certainly look at the credits. If I don't look at the credits, I probably wouldn't notice a running theme, even if the name was on the cover.
Even though I do try to notice somewhat (I'm not firmly in the camp of paying attention, although I lean that way now), it's not always clear who is responsible for the quality of the work. For example, I was very impressed with Mike Mearls' product for Atlas "In the Belly of the Beast. I liked the design and the way it had sidebars suggesting ways to customize the adventure. However, that wasn't necessarily his touch. It could have been the publishers house policy and maybe he could care less. After several products I noticed the trend was that I liked Mearls' products and found Atlas to have their ups and downs (more ups, though).
Glyfair of Glamis