Same feedback sentences filled on a seller profile - how reliable?

[anurag42]

At times I have seen sellers having feedback from same user-id(buyer) giving all positive feedback like 12-15 times over the feedback page. This isn't something I have seen once, have seen on more than one seller's page..

SO how reliable are such feedback, is it possible that seller's have manupulated some way to get such feedback's

[indiancoins4you2011]

no sir its repeat purchase from same buyers.so u see them

[faridafrommumbai]

Whenever a seller gets a lot of positive feedback,buyers think they have manipulated it.

[easeyoursearch]

I agree with the seller's comments