Being a blue-state big box retailer apparently won’t protect you from Berkeley lawyers. Now Costco is facing a sex bias lawsuitââ?¬â??possibly a class action suitââ?¬â??and the lead attorney is same guy who’s suing Wal-Mart. Interesting that the plaintiff took a huge paycut to move to Costco from … the Bentonville Beast : [S]he made more than $100,000 working for Wal-Mart and accepted a pay cut of about $50,000 when she jumped to Costco. Here’s the story.