In my view eBay fees have been fairly static in most categories over the last 10+ years. Managed payments are a touch cheaper than Paypal was. Some categories have had price increases.
Postage has certainly increased a lot on small items. Royal Mail 1st class large letters that were £1.29 about 3 years ago are £1.95 now, so I do agree on cheaper items, say under £10, it does feel like it's harder to make a profit now.