Does ebay Allow this.....

[Grifflander]

I don't know if it is rampant or not. What led to this discourse was the fact that although the seller said US-only bids in his description, he did not "restrict" it when inputting the various required data such as where he will accept bids from.

Without such a restriction, a non-US buyer's bid will be accepted. With a restriction it will be rejected (and often, international buyers will then ask the seller to allow them to bid).

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This is correct. You can add buyer requirements to your listing in My eBay under My Accounts preferences. Selecting buyer requirements