Just done some calculations for a £2 Arduino relay board based on being a Basic business account to see if people are actually making any money.
9p per listing
9.6% final value - 19.2p
PayPal - 26.8p
Postage - 53p
If I've calculated it right, to make 50p per relay I'd need to be able to get them for 42p each, delivered and duty paid. Selling around 250 per day to make any reasonable money. Obviously you'd have other product lines. But 50p profit per item would still mean shifting 250 items in total.
I've not even included packing materials there so it would have to be less than 42p DDP.
So realistically no one is making more than £1 per item, and probably not more than 50p either.
EDITED: 9 Mar 2015 13:24 by ANT_THOMAS