You seem to have determined to believe it anyway, simply because they say so. Anyone who posts stats & proof will be believed. Show everyone these 10% extra payouts you get..... 
Stats & proof or it ain't happening.
Where is the proof that you are getting 10% more on every payment? Where are the stats that clearly show this 10% payment?
Stats & proof or it ain't happening.
Ok, this is my last feeding of the trolls. This is my dashboard that updates in near-real time, so you could verify yourself in half the time it took me to take this screen shot.
http://i.imgur.com/XoCeJ1O.png
You should be able to calculate out based on the number of normalized to difficulty 1 shares that I submitted ("Pending Shares") the current PPS rate and my pending payment. Note that I am getting paid every 24 hours, a change I recently made there in order to produce fewer transactions in my wallet, and because I have grown to trust them to make the payouts like they should. The default is 2 hours and the maximum is 24 hours.
I'd really prefer to not post my current receiving address publicly, but if you PM me for it I will share it privately and you will be able to verify that my payout will be the pending + bonus.
My hashrate there is approximately 3.2TH/s.