I won't ever agree to work a design that is too ugly to be able to sell. I will ask for a reasonable deposit to cover the costs of materials and a marginal leeway for any potential problems, like if working with snakewood, and I will require 50% up front for anything that is player specific, i.e. with someone's name or person specific inlays.
Other than that, it behooves the cuemaker to only accept orders of cues that he could sell if the buyer is somehow unable to complete the purchase.
Also, there needs to be specific time frames for both parties where the money is either refundable or forfeited.
For example, if I give a date of completion of Dec 2014 if come March 2015, I haven't delivered, you should have the option of a refund of any deposits.
Also if I complete a cue by Dec 2014 and ask for completion of payment, if you haven't paid by March 2015, then you forfeit your deposit and I will sell the cue for whatever I can get for it.
This way both parties are protected and know up front what to expect. Now of course there can and will always be exceptions, but that is why good communication is so important.
Jaden <------ going out to shop to work on cues...