no matter whats the logo is.... it doest make any sense in seo prospective.. like your question here....
Congratulations, you win the dumbest question of the day award again. How the hell do you come up with these stupid questions?
Logo is unique identity of your brand & its like the face of your brand so yes its does affect your the traffic. Whenever the visitor visits your site logo is at top-left corner(std position) & viewer does scan the screen from left to right so logo will count among the many factor why viewer should further explore your site..