Random grab bags also aren't allowed, but typing into eBay's search bar "comic g" quickly identifies "Comic grab bag" as the top choice (even above "comic golden age").
eBay's policy:
Policy overview
We don't allow listings that sell an opportunity to win an item either by chance or in a skill contest. Specifically, we don't allow listings that promote giveaways, lotteries, sweepstakes, random drawings, raffles, or contests. These types of promotions are highly regulated and may be unlawful in many states.
There was a time I would flag these when I see them but there are too many and I can't help out all the fools.
And, as so often is the case, leaving them up gets eBay at least 10% of the sale if not 13%.
On a similar note I was wondering if eBay "double dips" when using eBay gift cards. Meaning I buy a $50 GC and use it on a $50 item. Does eBay also hit the seller for a 10% (or similar) FVF effectively netting $55 on a $50 GC?