What a studio does that a template does not
A template is a layout somebody else arranged around somebody else's argument. It is the right purchase when you already know what the page has to say and only need it to exist. It is the wrong one when the page is the argument, because a theme cannot decide what goes above your fold, what order your proof runs in, or what to cut.
That decision work is most of what a custom build costs. The code is the fast part once the decisions are made, which is why a landing page here is seven days and a site of up to 7 pages is three weeks rather than three months.