First off, welcome to the LEx Community!
Next, let’s correct your math because it definitely doesn’t go down the way you’ve described. Fees are only 5% total. The 5% includes payment processing (WePay) which is usually ~2.8%. That leaves ~2.2% for LEx to cover its operating expenses (ie employee salary & benefits, payroll taxes, hosting, 3rd party services & software, marketing, tradeshows, giving away thousands of sweet t-shirts to brewers at CBC, local, state, and fed taxes, rent, insurance, etc, etc.
The buyer pays exactly the price they see listed on the site (no hidden fees!) and the seller chooses the exact price they get/the list price (which includes the 5% fee). The 4 working-class founders all still have day jobs (and some of us have more than 1), one of whom has offered to breakdown a receipt for you. Please take him up on that offer and set the record straight!
p.s. If you ever have a question or concern about an order, the LEx Help Desk is always just a click away (see “HELP” at the top or bottom of any page on LupulinExchange.com).