Why should I click on the free ads in the PTC sites?

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You may be aware of the free or non paid ads in some of the PTC sites in the recent days..Though the sites are having the ads for the very least value, they still have the free ads.Though they are not forcing the members to click on the ads, they expect to do so...In general, I am not clicking non paid ads..Already they used to pay like $0.001 and $0.002 for the ads running for 15-30 seconds..Also most of the ads are not getting loaded in this time...Then why should we click the free links.I have strong opinion that these sites are cheating the members or will go scam very soon..What do you do on seeing such ads? Will you click the free links?Why?