The less sophisticated client will trust the builder more than the architect because “the builder builds it”. It sounds like you practice in a place that does not require an architect for residential projects under a certain threshold – I would make sure that the potential client understands that the plans that any contractor might draw up will certainly be less than the minimum standard of care to which any architect is held (without using those boring words) and that in your years of experience any project built wihtout an architect who designs the building and stays involved with the construction process is of lesser quality, and may even cost more, than with a highly trained professional at the helm. Its about bang for the buck. If the statement is made that the builder is protecting the owner from an architect designing something wrong, ask for specifics (bet you won’t get any). Ultimately, you are better of wihtout those clients. I know that I am.