When my daughter and I are trying a new vendor, we usually start out ordering the eliquids "as is" with no flavor shots or boosts, in the smallest size bottle that the vendor offers. If we like the flavor but think it is a little weak for us, with the equipment that we are using, we will reorder with a flavor shot or boost. With flavoring, more is not necessarily better. I have heard, here on ECF, that too much flavoring can actually "mute" the flavor of an eliquid, so I tend to be very conservative about extra flavoring.
Yes, at Mt. Baker Vapor, the flavor shots are for people who want a stronger flavor. For us, most of their eliquids are fine, no flavor shots needed.