There are multiple things that you can do on WikiAnswers to increase your contributions to the community. Answering, adding, improving, spell-checking, re-categorizing questions can increase your contributions as well as leaving a message on a message board and adding questions to the site. There are various different contributer levels on WikiAnswers as well. Remember that messaging people isn't a all day thing, message boards were originally intended for users to communicate praising them for their contributions to the site and stuff like that rather then posting one word comments like lol, hi, bye, cool, etc. but users are able to talk and chat with friends on WikiAnswers and see how they are doing.
WikiAnswers ranks your contributions by how many questions, answers, edits and community work you contribute to the WikiAnswers community.
WikiAnswers does not pay for contributions. All contributors and supervisors are volunteers who love the site concept.
Answer questions.
Its not
You can't
Unfortunately there is no way transfer contributions made as an unregistered user to a registered WikiAnswers account.
There is no end to the amount of contributions you can make.
200,000 contributions
No, there is no badge for 1,000 contributions. There is a badge for 500 contributions (Bronze) and the next one is for 5,000 contributions (Silver).
Rudiful2 is the top most answerer of Wikianswers based on the number of contributions.
There isn't a 'best user' on wikianswers. There is only those who have lots of contributions.
There's no limit.