Coming from a kid who thought his rogue was worth over a grand, it doesn't surprise me that you value a Tarantula Silk & Shadowfang at the same amount.
Tarantula Silk Sash is more rare than a SF but is certainly not in as much demand...still I'd value them similarly and have confirmed sales of both being in the same price range.
I find it funny how you actually believe your xharacter is worth 1000-2000$.
To give you an idea of why it isn't: a 5x r1 warrior just sold for barely 1500. Not a chamce yours wull go that high, especially when the Target audience for your account is generally younger and cant afford that. Keep dreamimg though, champ