I would imagine that they do. Ferenginar still has rules and things that you must abide by even when gaining a profit, or else they would have no need of the commerce authority to act as a regulatory body in the first place.
An embezzlement case might involve you paying your counsel more if they can recover a portion of your money through the legal system, winding their way through regulations, or having their own tricks to get it back.
Lawyers are also good for more than suits. A Ferengi business might have one on hand for dealing with all of those complicated laws, so they can focus their lobes on the business itself, instead of being mired in paperwork.