"The site currently charges a 10% commission on net investment profits to cover expenses such as advertising, server hosting, etc. The commission rate is subject to change. Notice will be given in this paragraph 7 clear days before any rate change takes effect.
Commission is charged when profits are divested, or at midnight (UTC) on Sunday each week, whichever happens sooner. Commission is never charged twice on the same profits. For example if you invest 100 BTC and it grows to 110 BTC by the end of the first week, you will be charged 10% of your 10 BTC profit. If your remaining 109 BTC investment then shrinks to 105 BTC over the next week, you will not be charged any commission at the end of that week. And then, if it grows to 119 BTC by the end of the 3rd week, you will only be charged 10% commission on the new 10 BTC of profit over the previous high of 109 BTC. At any point you could divest up to your original investment of 100 BTC without being charged commission since we consider that when divesting you divest the original investment first, and profits later."