Probably because too many sellers don't open unpaid item disputes against them and give them the strike against their account that they so richly deserve. Once they have 2 strikes, they can't get through blocks that sellers should all have in place (but don't).

If you have buyer requirement blocks in place, that can stop the repeat offenders from buying from you.

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Correct.

But I am a bit cynical and would go further than that, and say that for ebay, it is about the fees. Every seller who does not enter an unpaid item dispute (and ebay would be aware that there will always be some who won't) will be charged selling fees, so by default, ebay cannot lose. If a seller does open an unpaid items dispute, then ebay is no worse off, if the seller doesn't open one, then ebay is better off.

Ebay thinking is probably why should they worry too much about these types of buyers when there are procedures in place for sellers to open cases, issue strikes and block such buyers?

And by their lights, they probably reason that the buyer might pay for the goods sometimes.

My gripe would be that my understanding is sellers can't automatically ban people with one strike, it has to be two or more. I think sellers should be allowed the option to ban people with one strike from bidding.