Any car discontinued or not will gain in value if kept in mint condition.

No car not not discontinued or not will not not gain in value even without mints.

Drive on

Now mind you I think the SKY outshines the Solstice by a long shot, but this is the one thats going to bring all the cash down the road.

A general comment on collectability. In general a car that was popular when new, becomes quite collectable as time passes. Whether it deserves it or not. Case in point, a 1955 Chevy. There is nothing about a 1955 Chevy that indicates any kind of collectable uniqness in design, execution, value at the time of manufacture and the list goes on.
It was however extremely popular in the showroom in it's day. It is popular today. Something the Saturn was hardly ever and primarily responsible for the current position. Out of business!
But
if you look in the forums, the original Saturn, the one that took all the (undeserved) heat at the time, is the one that gets the most activity in the forums. It was in and of itself a unique car in many ways, poorly marketed and under-recognized. It is a car that has long deserved beater status as a cheap throwaway used car, but seems to hang in with some form of popularity. While by in large, the last offerings were both dumpy (arguable to some) and re-badged generic GM products from the international market place. Hardly a stellar recommendation.
Discontinued does not guarantee success in automotive collectabillity as many a sad tale can be found.
Realistically, how big is the waiting line to own a Gareau, last seen in 1910, in Canada.

Except when the 55 came out it was all the rage with the motor heads because of the new light weight small block 265 ci V/8. called the HotOne by everyone. It's said that the car changed the history of Chevrolet. It was a HUGE style change from all past Chevrolets. Other then that it was nothing special.

It's said that the car changed the history of Chevrolet. It was a HUGE style change from all past Chevrolets. Other then that it was nothing special
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Well yuh, but not over night, it took a little bit for that to happen.
but the 50's were a big break through for engine desighn from all manufacturers. All the engineering done for aircraft engine technology was finally cost effective to apply to mass production automobiles and the techno-race was on. The chevy engine turned out to be a winner. It still had to de-throne the flat head ford V8 and it did.
WWII and the first modern shortstroke v8 was the olds and the Caddy in 1949 with Studebaker in 1950 followed by various Chryslers products 1 at a time with a Hemi untoil Plymouth in 55 with the Polyspere version of the wedge. Ford in 54, w/ mercury. Lincoln in 52, Packard in 55, all other GM in 55, Kaiser still used a propiatory flathead I-6 but with a supercharger. Flat head I-6's were still being produced in 59 w/Plymouth and later with Nash. By then everything was over head valves but in line engines still mainatained the heritage from the 30's by being long stroked.
The chevy engine was a clear winner when the votes were counted and todays small block chevy can still be traced back to the 265 from 1955. A hell of a rcommendation whether you like 'm or not.
Heck even in the early 50's the Chevy stove bolt six still used splash lubrication on the rods until 1953 I think,

1955 changed "Chevrolet" over night.

I agree

Collector's Vehicle?

Go right ahead store it away in a temp controlled warehouse.......We didn't buy a SKY we bought a Solstice awhile back. We are driving the "H" out of it. It's a fun driver not sitting in the garage waiting for a value increase.