I completely refuse to rate. You don't get anything for it.
Helium is arguing that it's important to get topics sorted by quality - and yes, I agree, it's important for their reputation and credibility (hence for their revenue). But why should I do the work for them without getting anything back from it?
Ranking ist secondary to earning. If you have an article on rank 1 it might help your ego, but not your account balance. My best earners are ranked quite low. The key to increase earnings is not rating (that only keeps you from posting), but to write on topics which are looked for in search engines and advertise your articles by linking them in as many places as you can (before they block you for spamming

)