I think what you're missing are the cross border fees, 1% for cross border and then another 2.5% if the buyer pays in a different currency. So I suspect we're at 11.2% fees and then a real awful exchange rate on the currency conversion bringing out to a net 14.7% hit.
It's all in the small print here - Billing Policy | Reverb.com
Honestly I'd love to see it broken down as well now that I've been looking into it, it should be a standard receipt they provide for every transaction. The takeaway is there are many hidden fees, especially if you ship internationally.
Also I should say, I'm not super annoyed about it or anything. I knew what I was getting into and the bass was priced with the fees in mind so I got close to what I wanted. It's just not a simple 5% as the headline advertises.
Ok. All my transactions have been in the states. I've seen the foreign transaction fees come up on E-Bay. Yeah - gotta check all that - no denying. I agree that things are not always easily calculated. They should be. I should be able to look in one place and see what I paid for the item, paid for the shipping label, paid in fees, net total. Ebay especially seems a joke in that regard.