Why Las Vegas Sports Books have Jelly in The Belly, real scared to do anything

Why Las Vegas Sports Books have Jelly in The Belly, real scared to do anything Dallas -5.5 vs. OKc. The entire screen is painted 5.5. It's obvious to me OKC is the right side. It MUST be obvious to a few of the managers. So why not 'bet' on OKC +5+110! Just put up the line at 5, and book ALOT of Dallas-5. Nope. Jelly In The Belly. Too scared to be a linesmaker.........just be a lines copier. You cannot get in trouble when you copy everyone elses lines.
110K in profits pissed away......... If only the owner of these places had a clue what a world class handicapper could make them....... To be fair, some places (Hilton, M) do a great job............and do Shade numbers well!