Joining the Boardgame Players Association (BPA) has several benefits, including votes for Trial Events to be run at the World Boardgaming Championships (WBC), votes for the BPA Board of Directors, and--depending upon level--admission to WBC and souvenirs. A PBEM membership, lowest level of support, allows the member to participate in play-by-email tournaments and is good for the duration of the tournament, but does not provide a discount on or admission to WBC.
If you are interested in attending, WBC, joining BPA at a level that provides admission to WBC is typically less expensive than simply purchasing admission to WBC. However, if you wish to attend only a few days of the convention, you may wish to purchase WBC admission separately, which is only available approximately two months before the convention begins when the General Admission Registration folder is published.
Contact the convention director if you have questions about the best level of BPA membership for you.