Is it a good idea to invest on PTC sites?

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since I have been woking on Neobux for almost a year and now I have nly about $10 in my balance. As we have alredy known there are only 4 ads a day so it have to take a long time to each a biger number so my wonder is should I deposit my money to increse my balance for upgrade to golden member or keep clicking 4 ads aday to reach $100 and then upgrade leter.Atually,I am afried of lossing my money by earn nothing from them so, any suggest would be very really appriciate.