I assure you that you should take my opinion very seriously. After all, I'm smart enough to type JavaScript into a text editor, which makes me more qualified to make judgments about political/social issues than any journalist or politician.
Equality of opportunity means that no one is a serf or a slave, except people in the third world, who obviously don't count. It's important because it means no one can ever accuse me of having an unfair advantage over anyone else.
The stock market helps the poor by giving money to job creators, meaning that it might reach the poor eventually. Didn't you ever read Basic Economics?