Problem: my rating is not increasing ???

Alas! same problem with me.

Rating is anonymous. The reason is so that you can rate honestly and fairly based on the page itself without worrying about what someone else might think. It also removes the phenomenon of 'social rating.' That is giving an inflated rating that isn't relevant to the tip just as a way of saying 'hello.' There sure isn't anything wrong with saying hello though! You can always attach a comment to a tip or write email to the person who created it. Ratings should reflect the quality of the tip, and not the degree to which you are friends with someone

it may be the b'cos of they don't have any good developer like me...