Even with the fees it was still way more profitable to sell on ebay.
One idea i had to avoid scams was to not leave positive feedback until whatever the charge back deadline was for. So if they tried to scam me with a chargeback on paypal they knew i would leave negative feedback. I bet this scared a lot of scamers away.
I always thought Solarcoin was an interesting idea, sadly I don't think it's likely to have much success in this competitive market. I guess that is just my opinion though.. good luck!