Increasing Payout mimimum amount in the PTC sites..Why?

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Now all of the PTC sites are having their payment level $2.00 and this is for the first cashout only..Then if we need to request again , then the minimum amount required will be $3.00, $4.00,,,till they reach the amount of $10.00, for every cash out. What is the reason for that..Can we say such sites are tying to cheat the members ?What will be your activity in such sites...In my case, I will not be active for more than 2 payments if I don't have any referral in the particular site..Because, it will take much longer time to reach the higher payout levels for the members who don't have any referral.,Also it is sure that the site will not be online for more than 4-5 months..In this case, our loss will be much less if we stop clicking in the sites after two or three payment requests...What will you do?