Does it really make sense for gas giants to be this expensive to survey?
Probably yes. Because they're
huge.
Hundreds of times the surface area of even the largest rocky planet.
Thousands of times the explorable volume.
The high cost isn't just about how utterly enourmous gas gaints are, it's also about how long it would take to actually explore one.
Because making the player wait a non-trivial amount of time to complete this task would be bad design. Which is why larger planets and planets with unusual hazards cost more to explore.
It's an abstraction.
Also works mechanically as giants are guaranteed to contain an amount of the single most valuable resource, which even at the lowest possible level is a literal money fountain.
Giants will
never have zero resources.
They have a total of 45 pick 'chances' for spawning volatiles spread as follows:
- none > 0 (0%)
- -1 > 10 (22%)
- +0 > 20 (45%)
- +1 > 10 (22%)
- +2 > 5 (11%)
So basically, a 1-in-3 chance of having an industrially useful resource.
And a 100% chance of having an economically useful resource.
Granted, Cryo & Frozen worlds have the same volatiles spread. But they also have a much higher minimum possible hazard, and have some quite strict procgen limitations so they may not appear at all.
And colony setups based around a giant and it's moons are among the best it's possible to create defensively.
So not low value at all imo. I think the high cost is p. fair given the
guarantee that you'll find something useful in some way. Also, plus the previously mentioned convenience of being able to drop right into your colony from hyperspace if you do decide to put one there.