@bertwurst.eth
So we don't know exactly how points are determined, but it is based on your top 20 casts (posts) from the week.
So if you cast 20-30 times a day, in theory you might have a higher chance of getting a few of those to do really well. BUT I think it's better to focus on casting a few a day that you know are good content, rather than a bunch that are ok content. That way people don't get tired of seeing your casts!
Also, your casts that don't do well (don't get likes and comments) don't bring your score down, only casts that do well bring your score up.
People quote cast each other's casts because it's only things that you cast from your main page that get counted for Rewards, things in the replies don't go towards your score. So some people do all of their replies as quote casts because they think it will help boost their score. I think this is ok to do sometimes, but only if you have something new to add to the original, or something you want to bring to the people following you, not just for points.