It seems exciting but when you want to reuse a rocket, you need ......

1) to reduce the engines performances in order to render them reliable...

2) add wings to return the stages back to their base, which adds mass....

3) to check everything after it flew, repair, refurbish.....

4) to have the same kind of payload for the same lind pof orbital inclination...

All of them add up and the more massive a rocket gets, the more difficult and expensive it is to launch anything!

One more thing:

For the shuttle (or any reusable rocket), the orbital inclination matters a lot BECAUSE the shuttle (or the reusable rocket) will always have a mass that cannot be reduced, no matter which orbit it goes to. The only way then, is to drastically reduce the payload mass (to enable the fixed engine performance to get to that orbit).
HOWEVER, the percentage lost for an expendable launch vehicle is far less, because there, it's a matter of designing the rocket (with added boosters, for instance) from the beginning.

A 51° orbital inclination (ISS) is about 23° north of the maximum Moon orbital inclination (28°) (the Moon orbits the Earth between 5° north and south from the ecliptic plane which is 23° from Earth's equator).
The difference between Kourou and Cape Canaveral is 23° (Kourou 5° N, KSC 28° N) ; plenty of satellites were launched from the KSC for GEO.
Kourou is indeed better located for GEO than the KSC, but KSC is better suited for the Moon than Kourou (some times).

The problem is : the preferred orbital inclination is not always the same, depending on the mission.
The solution would be to locate a spaceport on the equator with an ocean to its east and north (all the way to 105° orbital inclination for sun-synchronous satellites ) (Brazil?) The spaceport would determine the type of mission. A space station at a certain orbit will always be limited in terms of what it can do.

This is perhaps one of the reasons why a space station visited by a reusable spacecraft (Von Braun's dream of the future) still hasn't reached its maturity.