I'm agreeing with imsaguy here, I use 5830's for mining, they sell for $70 + shipping in the US. If you want to sell it for more, you can offer to ship it internationally, but that does come with slightly more risks for both you and the buyer (customs, lost mail, + more shipping costs).
I'll offer you $80 + shipping to Europe (if its a reasonable shipping price, cheapest trackable method available), payment via PayPal or BTC escrow.
The reason you can sell stuff for more on eBay is that eBay offers the buyer protection against scammers, also if the card was to break within 45 days I'd have a much better chance of getting a refund through ebay. That is why buyers will pay more on eBay.
Also, just wondering why you think imsaguy's offer is insulting for your card, is your card able to overclock to very high speeds?
Interesting then that someone just bought one for $97 @
https://bitcointalksearch.org/topic/cpu-mb-psu-rig-accessories-clearance-sale-no-gpus-left-laptop-17-i9300-74810re: your last sentence, did you even read my original post?
5830's don't sell for $70. Bargain hunters or re-sellers look to buy them for $70, yes.
So you might be insulted because someone gave you an offer you don't like, but it is what it is and perhaps you should grow some thicker skin.
I didn't take it personally, I just said it was insulting.