The Lincoln Mark VIII Collector;s edition only differs fomr the 1998 LSC cosmetically.
2 Tone Seats, woodgrain gearshift and steering wheel, "Collectors Edition" On the inside door, and outside door trim as well as on the floormats. A gold plaque on the door jamb - thats it.
Are they more valuable? In general, yes. But thats also because most that I have seen are low mileage cars driven by little old ladies.