ClixSense is the most popular Paid to Click (PTC) with over 3 million members and over 4.5 million dollars paid since February 2007. Clicks worth up to 2 cents. If you are clicking often and you want to make money with this, you have to buy the $17 yearly upgrade. Considering the fact that as soon as you upgrade you will find a lot of clicks available only to upgraded members, this upgrade will cost you much less than those $17 and you will be in profit very soon without the need to refer someone.  Also, as a premium member you earn more at their GPT section, by completing offers and tasks.
ClixSense Review
ClixSense, like with most PTC websites, most clicks – ads go to the upgraded members as they have proven their buying power…
Of course there are clicks for free members too, but it will take you more time to reach the $8 payout threshold, while you can reach payout multiple times within a year as an upgraded member. Minimum cashout is only $6 for premium members.
You can buy a ClixSense upgrade via Payza, PayPal, Liberty Reserve, account balance and check and they pay you via Payza, PayPal on Mondays and Fridays or via check monthly on or before the 10th.AFFILIATE PROGRAM
Free members (Standard members) receive up to $0.004 for each referral click and $2.00 for each of their direct referral that upgrades to a Premium account. You will also receive 10% and up to $1 of revenues generated from your referrals ad purchases with a total of $50 maximum per member. You also earn 5% each time your direct referrals complete tasks and offers
Premium members – You are getting paid $0.50 for each new referral that reach $1 in clicking earnings. When one of your direct referrals upgrades their account to a Premium membership, you are instantly paid $2.00 for that member’s upgrade. Whenever a referral refers a new member who upgrades to premium you are instantly paid a $1.00 override commission. Even better, that same scenario pays EIGHT LEVELS DEEP! ClixSense doubles your commissions for every other way you earn from your referrals. You get paid up to $0.008 for each referral click, 10% and up to $2 for ad purchases with $100 total maximum and 10% task and offer completions.

ClixSense Review
TIP: To make more out of ClixSense, you must check frequently if there are new ads as some of them expire quickly.