Well sustainability.
We get a chance to earn from the profit sharing earned through others that buy advertisement services.
Yep, Like you wrote "we get a chance" - this website looks like Paidverts + Mytrafiicvalue and everyone knows how they scam people. And they are trying to continue scamming exactly like scrypt.cc - both websites still looks working, but thats are scams. This service is just waist of time and money. Next scam to the list.
Sites depends on it's owner and please don,t be too fast to judge.