PTC too good to be true or just scams?

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i have come across a fellow country whose actually earning $250 per month from PTC... small but good enough to pay the bill thus she's working from the comfort of her bedroom/house. Also if she would be working outside her house like in the bank, office or call center she would be getting the same amount. I am just new to PTC as Ia m eager to earn extra income while at home just enough to be able to pay my bills. There are people who says it's a scam there are those who are really earning. Is it just a matter of luck? Because even in business world... some internet shop earns big while others closes down. reply your experience eager to know about them =)