Making $400/Month from PTC

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Hello, good day... I'm really new user of this site and I have read a lot of discussion about money making. I prefer PTC for money making, because it's easy. I heard about Neobux, PalmBux and etc. But I want to know... is PTC really profitable and can really make some monthly cash for us? can it be our primary income? in my case, I have salery +/- $400/Month from working in office, how about I quit from office and focus on money making with PTC? and the last question is for getting $400/month from PTC, how much i have to invest? Please give me some suggestion, all your suggestion will be really useful, thanks you very much.