GPTPlanet is the sister site of Scarlet Clicks and has a already an acting record of a couple of years in PTC world. It changed script and design recently but except those changes, no significant variations are noticeable.
Personal Earnings: The personal earnings are something close to 1 cent per day without counting the PTSU offers. Considering this, you could resign from your job to start earning with GPTPlanet. Nope, reconsider please. :p
Referral Earnings: It is 10% per click value for the standard users and can go up to 150% for the most lucrative membership. Not that high for a member without upgrade.
Upgrades: Many upgrade packages which you can choose from. Look at the upgrade page for more info. → Upgrade Page
Referrals: After the change of script they have added rented referrals too. Bought referrals are available as option but not been shown in horizon. The direct refs are still there and can be referred without limitation in number.
PTSU: It has, but nothing special. Neobux, ClixSense and few more.
Advertising service: Still not tested (Pending)
Payouts: The minimum payout is set at the fixed price of $1 via Paypal and $1.02 via Payza every time you want to request a payment and are paid within 24-72 hours after request.
Communication: Forum, Contact
Important links: FAQ (empty – ridiculus), ToS, News
Trivia: The site used to be running on Aurora version but recently switched to PTCEvolution V4. It is owned and administrated by Dimitris Kornelatos since 2010.