Q&A backlinks useful or not?

Can anyone tell me:
1. how useful is this for better search engine result?
2. what should be the max amount we can pay for each Q&A backlinks?[/quote]

Backlinks are very important for SERP on search engine, it increases popularity of a keyword on a search engine...which contributes to the ranking on SERP...

Hope this would help,
Siyaram Textiles

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