I very much agree, not a fan of painted cues in general, but I do suspect it's both a cost issue and a estetic behind the customers request. Why waste perfectly good ebony or African blackwood for someone who want's a cue that looks like the body of a strat or other jet black instruments or other products? If done right adhesion of paint want be an issue (atleast not in my experience...) but ofcourse if (and when) the customer gets a ding in the laquer, it's not an easy fix in the same way as a cue with basecoat and clear, but we see production cues sell at a premium with what is essentially the same as a car or music instrument paint job, it's obviously a trendy thing now..My personal issue with painted cues and even some stains is that it doesn't penetrate into the wood. It also creates a barrier to prevent a sealer if one is being used to actually bond. It may bond to the paint or stain, but that doesn't mean it's bonded to the cue. Both Predator and McDermott come to mind on both these methods.
That's a big problem down the road.