Paid to click sites are coming and going so fast that by the time you reach payout most of the will be gone, made an upgrade in the system and all earnings are returned to zero or simply won't respond to your query
I suggest to join only proved sites like neobux, roudycash etc..
Also look for their advertising rates. it shouldn't be like in cashnbux where clickers(original and referrer) gets upto 4.5 cents per click and the advertiser cost is only 2 cents per click