That's a negative. Yes, I did look at the link I gave, which is why I gave it. Did you happen to take a look at the first book that is being sold on that link? Here is a screenshot. But I'll quote it too.
So again. How come the double standard?
What I was referring to is the fact that there are 10,400 items on amazon ebay related. That is a huge number.
My point was, do you think ebay knows about this? Highly unlikely. And yes, you did find one that is probably bogus and perhaps a violation of their mark and brand. I am equally sure that ebay does REQUIRE permission to print or publish or use the eBay mark or brand. REQUIRING and NOT SEEKING permission are two different things entirely. With 10,400 items listed on ebay, a safe guess might be 5-10% unauthorized items. This is perhaps an equivalent to piracy.
Now, books and periodicals and sites mentioning or using ebay is going to be harder to find and track down. Yes, they can google it. But I wonder how big their legal department is (I am sure it is large) or how many paralegals they employ to track down stuff like this. Perhaps they rely on the public to report this.
In regards to domain names, they (the legal team) does not have to take any time or effort to monitor domain names. Why? They are paying a service to do it for them and to immediately notify the legal department of the regitration of any domain containing the letters E-B-A-Y in that sequence. It is money well spent on their end to pay a service to do that work for them. I know this is also done with anything academy awards related (including those words, oscar, theoscar, nominees, nominations and any possible combination of those terms and words) as well as BMW, IBM, and Microsoft. Some are usually slower to respond, some quicker. The academy awards will nail you in less than 2 weeks.
When I got my C&D from eBay, I ran a search of domain name with the letters ebay in it. I do not remember the exact number, but I know my returns would only go to 10,000 and the total number was staggering. And that was just dot com. It was a bulk domain name generator that you could specify your search term and the extension (if I recall it was on WHOIS.sc which used to be a free service but not fee based).
The C&D letter is basically a form letter that they will send out to all the registrants. Some come rather quickly (about 2 weeks after regging) some come later.
Is there a double standard? Highly unlikely and very doubtful. One is just easier to find than the other. Electronically registered domain names flagged I am sure are much easier to find and spot and report than a printed book. Even you or I could easily print books our selves or find a very cheap online publisher who could care less about the contents or any copyright issues as long as money is good.
Perhaps ebay will offer you a reward of a free listing for reporting that book.