How much we can earn per month if we join PTC site?

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i been wondering people that join ptc site, how much they could get per month if they join one to five ptc site. if you could describe it here plese do so it here, i very interesting about making extra money but i want to know how much we will get. this is because it is a wasting a lot of time if we just get only one or two dollar in the end of the month. so if you could help me about this matter your are welcome to tell me here.