Halfdollar ptc took off?

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I was encouraged to join the site because of high click amount and low cash out.. After I got more than $1 I couldn't find the web connection of the site .But before it went off there were notifications when I attempted to cash out. The notice idea is, I couldn't successfully cash the amount because $1.54 wasn't enough for 120% of my investment. Where's the logic? I thought minimum cash out is $.50 what happened? Scam? my internet connection problem? Have you tried such incident in online earning?