While you are correct there will be those selling templates that someone else made, keep in mind that joining a group to build a base is not always feasible. More intricate bases can literally take several months to build and I have heard stories of builders getting booted from a group before being fully compensated.
As a builder myself, I would not mind being able to auction a template/shell of a base design and layout where someone fills in the details. I would also be curious if certain mission maps that already exist could be converted into base templates. I agree with @Yip this might be a great influence sink and could go a long way toward getting some people started with their bases.