In that size, be sure to look at the checking, if any. I've looked at 12/4 (3" thick) of various exotics that couldn't yield a single FS cue butt due to the way the checks (splits) ran. How dry is it? That thickness of hard dense wood will take years to dry, and may crack further during the interval.
If it is clear dry lumber with no checks/large knots/splits/minimal wane (sapwood it would be quite valuable as Mr Barrenbrugge notes. If not, it is a very expensive pile of material that might only yield pens, tops, and other tchochkes.
All that said, cues are often listed as "all ebony" or "all rosewood" when its a cored short splice wrap with a few slivers for the points and a nice butt sleeve. That type & size material can be got out of a lot of otherwise useless wood.
smt