Some sellers put a block in place that limits how many items a buyer can purchase from them in any 1 week period. For the most part, sellers use it with expensive items - the type most people will only buy one, like TVs, preventing scammers from buying up big and also helps curb auction interference.
That being said, some sellers use it on items where buyers typically purchase many different things, for example, jewellery findings. Say I want several items from the same seller, and to take advantage of combine P&H. I start buying 2 of this, 3 of that... then when I go to buy something else, I'm blocked. While I could do many things, including contacting the seller and asking to be exempt from their blocks (which I only ever did once, years ago - phone verification - and frankly would not do again), I'd simply end my purchasing, and wish I had known so that I could plan what I purchased beforehand.
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