Up to now, I've had no comment, but as one who frequently buys and occasionally sells online via various methods, the integrity of those involved is crucial. That said, this seller seems to have had a pretty good reputation, and has been around a while on this site. Past transactions have been completed successfully. One or two bad experiences should not serve to condemn the entire venue. There is a risk involved any time I make a purchase online. I have lost some substantial money, several hundred. This was from a supposedly legitimate, but basically one-man, company when the owner suffered very serious health problems, and my situation was never resolved. It happens, and is a risk when counting on other to fulfill obligations, especially in a delayed fashion as opposed to face to face - I pay, I get the product. Sometimes a situation is just unmanageable.
I can think of several scenarios where, if an individual is solely responsible for following through, a transaction could be fouled up. The person could have become incapacitated for a number of reasons, possibly not totally, as in unable to click on a site, but left with no capacity to follow through.
I guess my point is that this person was an active member here for quite a while, honestly completed transactions in the past, and has suddenly become non-communicative. My first and actually my continued response is that SOMETHING has happened to alter the situation. While letting others know that this seller may not currently be reliable is fine, I do not think it appropriate to attack his character, but rather give the benefit of the doubt, that if he was capable of correcting this, he would. I would feel the same, even if I were the one to have been the unlucky party. As mentioned, I have been.
Now if he returns, and begins again to post and offer items for sale, then by all means, he owes and explanation, apology, and refund or fulfillment of his previous obligation. In the meantime, benefit of the doubt seems appropriate rather than character attacks.
Not trying to be on a "High Horse" or anything, but I work in Emergency Medical Services, and see every day how suddenly competent, honest and very moral people can have their lives changed. It happens in an instant, and could happen to any of us without warning.