Hi friends,
How many of you have good experience (with respect to targeted traffic) via yahoo answers service.
Is it wise to buy some one who can post our links ??  Is it worth??
Any suggestions in this matter?

It was a good experience but not excellent.

Is it wise? I would say 'no' since Yahoo! is 'nofollow' and you will not get any backlinking credit for it. But its a great source of traffic which is equally effective.

Is it worth? Contributing to the community is good but solely depending on it  would be kind of foolish.
You need to put in extra efforts to get a good Yahoo! ranking. Here's Yahoo! optimization guide,
http://help.yahoo.com/kb/index?locale=en_US&page=topics&y=PROD_SRCH&topics=TOP_WEBMSTR&pir=vEuU9UdibUk05UVwnDJHinc4zeC4p.zASSTugjYcva4zNNP2pmR5RUl4ni_CXrCE2.JPiBfeEmUfNEMPWP1O.7qI9yfS7lJocGpMTH4XysIeYPZrEVOGei_hTIJ7ncD8R3PK9fnmUR.zKwx88cK_4n1gLq7p7iMw.NBK6TQnrp2eeJNNoCDLBpGtKTwTEOHFsuZrrb4if9_lFIgTTSVFP1KUlA--