On many occasions.
Just recently they sent me an email offer where if I sold something within a specific time period I'd get $100 coupon to spend.
http://imgur.com/a/KPaJWThat's the email they sent me.
Clicked the activate offer and since I was selling the camera at the time I decided to just go with that.
I accepted a best offer $50 below the market price for the lens that I was selling and then paid $50 for fees and ebay refuses to honor the email.
Going to dispute the fees with my credit card because **** ebay.
I've paid thousands in fees to them and in above average standing >.>
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If only there was ebay seller protection to protect us from ebay