Your Experience Selling on Discogs

I recently opened an account on Discogs to sell some records.  They sold fairly quickly.  However I do not understand the fee structure and perhaps someone with experience can explain it.  I did email them with questions regarding the fees but all I got back was a cut and paste paragraph from their website.  I do not think they have any kind of formal "contact us" other than bot responses. The fees I understand are the paypal fee, 4%, the discog fee, 8% but there was also a "partner fee" of 17%.  The "partner fee" is described on their site as "the term used to encompass the total fees associated with your order".All told, my share of the fees was 26% of sale, excluding the shipping cost, which I assumed.  I do not mind paying fees for services rendered but this site seems to have a lot of hidden fees that do not pop up until the sale is over.