@ficuswhisperer wrote:
It's for aesthetics. It reflects the era the comics is representing.
You'll notice panels representing the past (like those representing events in the 1970s) have little color while panels closer to the present are bright and saturated (like the two in this one). I think it's pretty cool myself.
As another mentioned it looks brilliant in print. I certainly don't find that it detracts from readability either.