The initial technical assessment on the feasibility of an idea or feature is within the domain of a programmer/developer, but I think it would require a non-developer to help do the cost/benefit trade-off. The reason for this is I've worked with so many developers who are excited by a technical solution, when the cost of it is prohibitive. It may have been the "best" solution, but it would have been very costly.
I intend to submit my startup idea as part of the YC winter funding event, even though I do not have a developer on-board yet. It's been hard finding a developer who is able to take the plunge and sacrifice the security of a cubicle farm. I have advisors/friends who are developers, but they don't want to take the risk, despite agreeing with the idea.
Thank you to everyone who have shared their thoughts.