Sometimes an item that is in violation of a policy remains only because it has not been reported yet. Your item was reported. The second item you mentioned above has been removed so apparently that was reported as well.
According to the liquor policy, there are pre approved sellers so maybe some of the sellers you have seen are pre approved thus are allowed to sell liquor.
http://pages.ebay.ca/help/policies/alcohol.html
If you feel a listing is violating the same policy your item was removed for, feel free to report it by using the Report Item link within each listing.
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Non payers should get unpaid item strikes and be added to block bidders lists. Period.