OP YANBU.
I use ebay mainly to sell the odd unwanted household items and when it started it was great for this. The trouble is that eBay don't want to bother with millions of people doing just this, they want thousands of 'power sellers' selling millions of items of tat from China, which makes them more money.
With the latest changes, its starting to be not worth the bother for people like us anymore. Eg, I have a Bodrum teapot for one, that I don't use because it is all style and no substance DP got me a better one and I might sell that next time I have a selling spree, as I might have got nearly £10 for, but now the postage price has gone up from about £2 to over a fiver, because the box is about 3 mm bigger than their small parcel cube limit, this will impact the selling price, to a level where I probably won't bother as the profit will be much lower.
I have no idea what my stars are because I never look. I also try to ignore my feedback, as I think this is unfair against sellers - I don't leave feedback for buyers any more as you can't leave anything other than positive and there are plenty of buyers that I did not have a positive experience from - eg those who contact you the day after an item finished at 10 pm, with the 'where's my item' question.
I generally charge exact p+p or round it up a bit, or if I am sure the item will sell for a decent amount, I might offer free p+p - I usually start at 99p as the fees are less, but you also have to consider the issue of 'non rational herd behaviour', as I will explain:
People often say 'set the starting price for the item you want, including p+p and offer free p+p'. However, take an example where one item has a starting price of £30 incl p+p and an identical item has a starting price of 99p. There are no significant differences in the reliability of the seller, stated postage times etc. It is likely that the item that starts at 99 p will sell for a higher price than the item that started at £30, which may not sell at all unless the value is significantly above £30.
I've seen it happen time and time again - people take the lack of bids on the £30 item as a sign that there is something 'wrong' with either the item or the seller. Presented with the £30 item with no bids and the item that started at 99p and has several bids that have bid the item up to say £35, many people will go for the more expensive item.
It is the same process as with two similar restaurants next door to each other, where people just walk in, rather than booking a table - if one is empty and the other already has a few people in it, most people arriving later will pick the restaurant with other people in, because this is a sign that that is the 'better' restaurant and there is something wrong with the one that is empty.