So the question begs, as a potential buyer, is it my responsibility to pay for the the shipping of the cue for me to test as a potential customer, or do I need to pay for shipping one way or even both ways? What is standard? I agree and someday I will learn, hopefully soon.
It may very well be.
Don't you owe it to yourself to know you are getting "THE" cue? What is average custom cue price these days? $1,000.00? More? Shipping both ways will be... $50.00 or so? For an inexpensive cue, it doesn't make sense. You have to gamble a bit.
But, if I'm buying an 'expensive' (and that term is relative) cue, generally the sellers offer a return privilege so I can try it out for a few hours before I commit to keeping it. Sometimes this means center ball only (no chalk!) but you can pretty quickly tell a 'dud' from a 'player' in an hour or so... Sometimes that first hit tells you all you need to know.