They run compitions with prizes like ipods etc if you dont wont to enter them then just make a fails address, there is no spyware what so ever no adverts they make there money like all the other f2p games with cashshop items this is not the only game they run.

http://co.91.com/
http://www.eudemonsonline.com/
http://www.monsterandme.com/
http://www.crazytao2007.com/

All with cashshop all been out longer than zero and have no complaints about being a scam or spyware.