Satellites are part of unmanned spaceflight, not manned spaceflight.
Here I am talking about human spaceflight, even when I leave out the 'human' bit...
Sorry, but I think your selections are just for trolling, and I am so selective now as well that I am ignoring your selectiveness. You attack spaceflight in general and always jump back to manned when you feel framed. And I get tired of it. if I ever might wonder why South Africa has no successful spaceflight program, I will remember you and that you have no sense for success at all.
How do you rationally measure the success of manned spaceflight? By gold and silver returned from the moon? Martian slaves? Seriously: You can only go by one measure: Could we have done it better with unmanned technology.
And that is pretty easily answered: Even for such propaganda missions as landing on the moon, the scientific value returned by the manned missions exceed the scientific value of unmanned missions that followed by far.
The Russian unmanned soil sample missions returned lunar soil at the scale of grams. The every US manned mission returned kilograms and contrary to the Russian probes, they had not been forced to take samples from what is by chance below the probe collector arm, but also had been able to do a good selection of typical and atypical rocks at their landing sites, build up a large seismometer grid with accuracy, even take samples of unmanned probes that had been on the lunar surface for years.
Now, you will go by "Do we need this knowledge". Yes. WE as whole do need it. No, you don't need it. You personally maybe are lucky with the knowledge where to find a shovel to dig yourself a hole, and call it success when you are finally buried. But the remaining 6 billion humans on this planet need this basic research.
You can not always tell in advance, what you will discover when researching a question, and when you discover something, you will often not know how important this discovery is yourself, until you finally get a call from Oslo after some decades without much attention - because a very innocent basic research by you finally resulted in many applications that changed the world: And you are the point where all paths of fate join.