As mentioned the majority of ebony seen on the market today generally has some form of brown coloring in it somewhere.
It is rare to find solid black ebony unless you know where to look and are willing to get your wallet out to pay double or in some cases triple of the going rate for common ebony. World wide there are several different species of "ebony" that can and will produce different colors from almost a light brown to a coal black. Again, the darker black the ebony in it's natural state the higher the price that will be placed on it.
Yes, some have and will doctor the wood with dye or some type of dark coloring to enhance it's look and try to push its value higher in a finished product. This practice has been used for years throughout different trades. The billiards industry is not exempt from the same practice.
As far as the ebony wood characteristic in a cue, if it is a solid non cracked or checked piece, regardless of its color it mostly all plays the same.
Not trying to degrade your cue as it would have no effect on the playability, but I would be more concerned with sanding scratches in the finish than the color of the ebony. But this is just my personal observation of the picture you have provided.
Enjoy your cue. I'm sure it will serve you well.