I've seen this before and my understanding is that the seller doesn't want to give you their address because if there is any dispute you could settle in person, rather than having to rely on ebay's system which from my experience vastly favors the seller. Hence, this is a reason to be suspicious of this seller. There's no point in checking their "feedback" score because that is meaningless. A seller can never get negative feedback because a seller never leaves feedback until the buyer leaves feedback. Most buyers don't want negative feedback so they give the seller positive feedback (or like me, no feedback). It should be compulsory for the seller to leave feedback as soon as they receive payment.