I've definitely noticed prices rising these past few weeks. If you have one you're not using, now is the best time to sell.
I listed a new, sealed one the other week. Set it up as an Auction with a Reserve Price. I set the min. bid amount to $620. I also offered a Buy It Now option ($975). Within 4 hours, I received an email that my 2.3 quad sold!
eBay fees are 10% of final selling price, which includes shipping charges. Then there's additional $10 - 20 expenses (if you didn't add these to "handling" fees) to cover insurance and extra shipping options like Signature Required. On top of that, PayPal takes 2.9% of the total paid by the buyer.
While it sounds lucrative, the fees cut into your profit. I would highly recommend a Reserve Price to not incur a loss (note: eBay charges 1% of the Reserve Price..and it's charged even if the item is NOT sold - e.g. you decide to close the listing early.
Your profit is less 15% of the selling price.