The only requirement potential members must have is a keen interest in archaeology and a desire to discuss their interests with others. It is assumed by the moderators that anyone requesting membership has such an interest, and thus will be accepted without further inquiry. This policy is subject to change if it is abused.
The only reason that XPArchaeology was set up with the "members must be approved" option is to screen out casual lurkers or those who might only want help with their homework. Though it is permitted to join and never post messages, such lurking is not encouraged as an active membership makes this forum more fun and informative.