Carol, without a proper long term study I don't think we can assume that W/C's generally lay larger clutches. Just because a few do doesn't mean that all do or that a captive bred and born female, of an appropriate size, isn't just as capable of dropping a large, viable clutch.
Remember too, most people will brag on the internet about their successes with these W/C gravid females but they rarely tell you about the flipside. I have a "flipside" female BP here. A W/C imported while gravid female that dropped her eggs then never ate. She went through two owners before coming into our hands and she's been work to bring her back. That work is with absolutely no guarantee that this snake will ever breed in captivity.
Don't get me wrong, Danu is worth every single moment spent on her rehabiliation but this whole idea of grabbing up gravid imports thinking you'll get huge clutches and an easy route to a breeding female always worries me.