True.
But think of it this way. You are charging less in total fees than eBay is, correct? (eBay has listing fees, then final value fees when your item sells, then PayPal, which is owned by eBay, takes their cut, etc.)
If you charge less in fees, I guarantee the sellers won't report you. They are there to make money, and if they can save money using your website versus eBay I'm sure they will.