"The public sale is likely to have significantly less available inventory because of a higher number of existing season plan holders, as well as the strong response we have received from people who have agreed to become season plan holders in 2015," Orioles vice president of communications Greg Bader said in an email. "The guarantee for future season plan holders to purchase at least one home game in the ALDS has been a huge incentive in encouraging fans to sign up and place deposits."