My guess would be the price differential was due to the extra work involved with a carved arched top and binding. I think the same was true for Gibson SG and Les Paul guitars. To be honest, in terms of playability and actual weight, I prefer S-100's and SG's.
Never been a big fan of the Les Paul design, although ironically, my back-up to my Starfire bass is a 1973 Gibson Les Paul Triumph. It sounds so wonderfully good that I just forced myself to get used to the ergonomics of it. At least it's a short-scale and standing up playability is not so bad... but man that tiny body can feel cramped in a seated playing position! Sure wish they would have done an SG counterpart with the same neck and electronics.