OK, time for some maths...
If you want to buy a PS3 off us it will be £340 shipped. So we will work on that price and if you want to say we don't get charged VAT & Import Duties then that's fine.
So you get your PS3 and list it on eBay for £420 + £20 Shipping (to be competitive).
The insertion fee would be £2.00 and then we want to add the gallery feature so that's another 15p.
Your in luck! someone just brought your PS3, so you have sold it and there's a final value fee of £14.25. Giving eBay fees a total of £16.40.
They paid by Paypal so lets work out those fees 3.4%; that's £15.16 to Paypal.
As stated above you charged £20 shipping so lets go to the post office and say it cost £20 exactly to package it and send special delivery.
With all these fees took into consideration you just made
£48.44 Profit.
I think you went wrong with the eBay fees, they might be steep but there not that high
yet.
These prices are worked out for people selling on eBay UK. I also don't think shipping would be that much.