I thought lowest PPC we could get is $0.05 from adsense but i have recieved $0.02 twice and today i recived $0.03 so I guess there is no minimum value ?
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You're not just seeing MFA's, you're seeing the effect of Google's Smart Pricing. Advertisers pay more for clicks that are more likely to convert (to sales, leads, subscriptions ...) than they do for those which are not as likely to produce measurable business results.
Exactly how this is determined involves Google voodoo and a number of other factors, but what it means is that two sites, displaying the same Adsense ad from the same advertiser, can get very different revenue from a click on that ad, depending on how well their site(s) convert for advertisers. Sites (plural), because it's rumored that one poorly-performing site can affect your entire account.
Bottom line is that if your sites produce high-value traffic for Adwords advertisers, your Adsense will produce better results for you.
More on smart pricing - older articles, but still relevant: