How does it pay more, is it a charity?

I would advise against mining to any U.S based pool, those pools are subject to weird American laws, look at what foundry pool does, they blacklisted dozens of addresses of which they don't include any of the transactions related to those addresses just because the U.S government decided to blacklist those addresses for whatever reason, does Luxor pool do the same? if not, how could they go under the U.S radar by including transactions of addresses flagged by the U.S government?

Sooner or later all U.S based pools might be forced to mine what's called "clean blocks", it's a very bad thing for what bitcoin stands for.