I sold mine for almost £80 each on Amazon which is safer than ebay, before the new model was announced.
It is a good deal if you don't want the hassle of getting an extra £10 by doing it yourself. However, did you notice the condition "The system version currently loaded on your Apple TV must be 4.4.4 (no later)."
I would be cautious about EBAY. It is virtually impossible to offer a valuable, electronic good on ebay without attracting the attention of the Paypal scammers.
What happens : you get a very high bid which wins the auction. You get immediate Paypal payment. You send it off. They contact you to say it is damaged and they want money to settle, say 50% or they will open an EBAY case. You pay up or they open a case at which point EBAY / Paypal take the money off your balance or out of your bank acc by direct debit and hold it while they "investigate". Ebay get both parties to trade messages; while EBAY advise you to settle. If you do not Ebay "investigate" and then find in favour of the buyer. The buyer is obligated to send your item back and to get a delivery signature. At this point EBAY give the money back to the buyer and the case is closed. EBAY will not listen to any further details from you. If you get a box with a smashed Apple TV or a box of rusty nails, then it is your tough luck as the case is closed.
EBAY have a policy of finding in favour of the buyer in almost every case. This is a cynical way to make EBAY safe for legitimate buyers. Paypal scammers just love it. You also cannot give the Paypal scammer negative feedback. EBAY doesn't allow that.