Stained jeans on poshmark

So I found these jeans I absolutely love on poshmark, they’re regularly expensive jeans but the seller has priced them at $50 due to a huge coffee stain on the back. She claims it can easily be washed out but I’m a bit weary. Is it just me or does $50 seem like a lot for stained jeans? Like what if I get them and the stain doesn’t even come out. Has anyone been able to get coffee out of jeans?