Sorry, eBay sellers are allowed to block countries, states (one seller blocked just California), block buyers and potential buyers individually without reason all verified by eBay customer service all done for the sole purpose of protecting the self concerned seller.
Nothing and I mean nothing should be listed for sale on eBay that the seller cannot afford to lose and receive no payment. Likewise no buyer should actually expect to receive what they thought was a finished purchase.
When I purchased one item on eBay the seller cancelled the $50 sale because someone offered four figures for the item if the seller would get a certificate. I had the emails and (legally) recorded phone call to that effect. When I contacted eBay I was told that all they could do was note the sale cancellation with supporting information and make the sellers listing a bit more expensive and show lower in the displayed listing, however they could not force the seller to make the sale. APS had no interest in enforcing the sale either. In another case, with a $110 cover I received a $79 cover damaged, eBay, agreed, and force the seller to accept a return. I was blocked by the seller claiming the cover wasn't damaged when sent. I received an item which clearly differed from the listing picture which showed a QE4 with joined A-T but received a plain QE4, seller claimed he sent what was in the photo and if he did not, I still got a super price for the MNH set of QE1-4. Customer service at eBay said it looked the same to them and failed to take action and the seller blocked me. Funny the history for the seller showed him selling several examples of the set. These two blocking occurred within the last 6 months, to no sale 5-8 months ago.
But back to Torin's camera, 50% cash in hand might be better than 100% no cash in hand and loss of item.
One final suggestion for Torin is to contact via eBay messaging other sellers of cameras (or whatever specialty item) and ask them what to look for and how to protect themselves as a seller. The is one active seller on eBay who sells, stamps, postal history, Philatelic Literature film camera bodies, lens and attachments.
Regarding the comment we all start with lower feedback, I point out good buyers increase their feed back. Crooked, dishonest and theiving buyer don't achieve high feed back scores before eBay cancels the account.
In today's America, the rules seems to be set to protect the "identified victim" be it on eBay (the buyer) or the balance of businesses going cashless where the business's employee will not face a robber with a gun in the employee's face demanding cash is balanced against the poor and unbanked having the ability to purchase goods for the same store. Right now the poor and unbanked is a greater concern that the employees facing a loaded gun and loss of life for not handing over cash. Or the two year old birth of triplets story recirculating now: https://www.babygaga.com/parents-su...iplets-nicu/
where the citizen family was billed $4,000,000 (4 million dollars) for the uninsured birth of their triplets when a mother in the country via documented or undocumented entry would not be billed for the births, rather the Federal Government would pick up the tab for those poor. Life is not fair and the winners are often picked by emotion or politics with no relationship to correctness nor whom the truly harmed party was.
EDIT: Torin, send me a message on the SCF messaging system and I will provide the eBay seller's ID.