I mean,is there any websites like GA with more quantity of knowledge
transactions per day?
Are you satisfied with GA?

1) No. GA is the  best

2) Funny to ask a GA researcher that question.
   Since we are free to contract, we would not be here if we were
   dissatisfied.
   That does not mean GA cannot be improved. 
   But that is true of any job, right?

Anyway, for $2 you are entitled to at least one link
(per GA price guidelines)

here it is:
http://answers.google.com/answers/threadview?id=265924

hadgie  - GA researcher

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Request for Answer Clarification by alff-ga on 15 Oct 2003 16:28 PDT

GA researchers do this for money? or for their own research needs?

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Clarification of Answer by hedgie-ga on 16 Oct 2003 09:02 PDT

That is a complex question Alf

Perhaps too complex for this price.

We have different motives and both motive are often present,
it is not either or.

Read the FAQ:

What is the difference between a Google Answers Researcher and a
registered user?
Google Answers Researchers are screened and approved independent
contractors who are paid for posting "answers" to the site. Registered
users can ask questions and post comments to the site. However, they
cannot post "answers." Users are neither paid for comments that they
post, nor are they charged for comments that are posted to the
questions that they ask.
http://answers.google.com/answers/faq.html#aboutres

and read this question/answer/comments

 http://answers.google.com/answers/threadview?id=261719