Is Filling surveys in different sites a good way of earning safe money?

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I've seen many sites offering big earnings through responding to different market surveys they are providing. I too tried with lot many sites. But majority of them were only for united states nationals. Also i found it very difficult to get qualified for taking part in surveys and thus to get paid. Because all of them are mainly for a particular segment of population, and we can't even know which criteria they use to assess our qualification to take that survey. and if i got qualified, those surveys won't be giving money but they will give only some market points equivalent to very fraction amount of money. So i think its also not a reliable source of money or reliable kind of internet job. So come on friends lets talk about our experience in such internet job sites and survey providing sites.. have you guys at any point of time tried such surveys? Is there any kind of really working internet jobs. Let this discussing help us to find a new reliable way to make some extra money for our extra needs..