What to Submit
On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity.
Off-Topic: Most stories about politics, or crime, or sports, unless they're evidence of some interesting new phenomenon. Videos of pratfalls or disasters, or cute animal pictures. If they'd cover it on TV news, it's probably off-topic.
I personally don't find this terribly interesting, but billionaire athletes are certainly a new phenomenon.
Billionaire athletes (through endorsements) are the result of a sharp rise in consumer consumption, media saturation, and globalized market place the last 20 years. How is that a phenomenon?
Why is it that an entrepreneur that gets rich is frequently criticized for making too much money, taking it out of the pockets of his customers; while on the other side of the coin, the sports figures who haven't created anything (other than a feeling of satisfaction in fans, I suppose) are still celebrated?