joko is right, you should be selling for 99p (if that's what you want) so you get a free listing, but then you should be charging the going rate for postage - I sell a lot of small-value house-clearance stuff on eBay and my standard postage charge is £2.50 - it'snot just for postage, also for buying the jiffy bag or bubble wrap. eBay are quite clear about what you can charge for without going over the top. If teh thing is tiny and finally the postage is say £1.25 then I would refund something to the buyer so as not to get poor charging feedback.
Re sanden's tickets,I'm sorry to hear that but the site is very clear that you have to raise disputes in 45 days, I have had buyers default and been able to reclaim all the cost via the system, but you have to adhere to the timetable which is not unreasonable in my view. I must admit it wouldn't cross my mind to buy something like that from eBay, you don't know the tickets are genuine, you have no redress and there ARE clever scamsters out there selling.
I don't see they are doing anything wrong, so no petition please - before you sign up they make it very clear what you are going to be charged, there are no surprises. I have two ways of getting round the PayPal fees (although I insist on PayPal for overseas transactions) - either people collect on occasion, or sometimes people send me uncrossed postal orders which you can cash straight away. This doesn't happen often but when it does - final fee paid to eBay, you have used their facilities after all, but no PayPal fee.