eBay practices what is known as "selective enforcement" on their site.

Basically, if someone complains, they cancel your auction. The onus is then on
YOU to prove the item is NOT prohibited under eBay rules. Guilty until proven
innocent, in other words. This is difficult if not downright impossible to do,
since you're dealing with an entry-level drone on the other end who doesn't
have a clue as to the specifics of radio equipment. You're likely to receive
only form letters in response. Most of their customers simply give up in
frustration. This is their intention. eBay has become just another oversized
corporate conglomerate. They don't want to bother with some guy selling a ham
radio. Realizing they're the only real game in town with regards to online
auctions, their stance seems to be "We'll do what we want. We don't care."

I've seen this happen time and time again: legal, unmodified 10m radios,
advertised in the ham radio section, being removed from the site. Meanwhile,
modified radios are allowed to continue being auctioned in the CB section.
Radios clearly marked as "modified", "extra channels", "full 26-28Mhz
coverage", etc., in the Item Description. Also linear amplifiers, which are
clearly illegal in all cases.

Ditto for pre-ban scanners with 800Mhz coverage. Units made prior to April,
1994, with no mention of modification are pulled while others described as
"full 800Mhz coverage", "cellular unlocked", "modified for cell", etc., are
allowed to continue.

I believe a competent attorney could, after sufficient documentation, make a
strong case against eBay on these grounds. Given the millions of users, it
wouldn't be too hard to then have class action status awarded to the pending
case. I'm not a lawyer, nor do I play one on TV, but I sure would love to see
one take them on. This game has been going on way too long now, as any regular
buyer of radio gear via eBay can attest to.