I used to work for Lousiana Pacific. Finger-jointed dimensional lumber is ususally less expensive than unjoined wood. It is re-manufactured from shorter scraps when significant defects (knots, warp, wane) are removed from lumber. It is straight and very strong and conserves wood resources. It has become more common practice since larger trees with fewer defects are increasing difficult to acquire.
The strength of a piece of lumber is impaired by defects in it. Grading rules are based on the size and number of defects observed on the surface of each piece. Finger jointing allows defects to be removed and can change #3 lumber to a #1 structural grade increasing its value. There is a slight discount passed along to the consumer, but the resulting lumber is first quality and the joints are actually stronger than the unglued sections (failures in testing are generally to unglued component). Most remanufactred lumber can be used in any structural application, but some lumber is certified structural in compression only, meaning you can't use them for joists.
Don't know that I would consider re-man superior to solid-sawn lumber of the same grade, but cost should be lower, not the same or higher.