Open guilds are massively used for store visits. Should the store be reserved for established guild players? How about making the guild store only accessible after 24 hours of membership in a guild, just like a focus is only counted as a scroll for the lodge after 24 hours?
Background info on this see
https://peakd.com/hive-179856/@anjanida/guild-store-proposal-and-our-135th-brawl-statistics-anregung-fur-den-gildenladen-und-unsere-135-rauferei-statistik