Why would you pay an entirely optional 10% promotion fee if you don't agree with it? Just amend the percentage or disable promotion.

Plus eBay's fees are not great, but Amazon's referral fee starts at 8% and is 15.30% on the majority of categories, BEFORE they charge you a closing fee, plan fee, storage fee, and fulfilment fee. Oh, and they might just decide one day that you've somehow vexed them in an unspecified way and issue you with a Section 3 that effectively bans you from the platform because well...they decided. And then they'll charge you to get your stock back, or destroy it and charge you a disposal fee.

It's crazy how you sold an item for £25 with no views though. Gotta love that.