I can remember a couple of total lunatic ebay sellers years back - one sold vintage cards and the other sold vintage pool cues. These two were both completely bat-sh*t crazy. But they both had great stuff, and if either was selling something I really wanted, I held my breath and put in my bid, knowing it might end up being a transaction from hell.
It goes the same way with lunatic ebay buyers. How badly do you want their money? Obviously, if you don't block anyone, you will have more problems, but also obviously, you will make more money.
I once blocked someone who made an offer and then retracted it, and it turned out that he was just crazy. Months later he asked me why he was blocked, so I took a chance and un-blocked him. He ended up spending a lot of money on my stuff, often with weird questions attached, etc., but his money was good.
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