EVE Online currency sellers rip off players (shocker)

Well, here we are again... certain people among EVE Online's player base who buy their isk from shady sites are the focus of another dev announcement. GM Grimmi just posted the following: "We have had a number of cases recently with hacked accounts and similar issues and we have found that a lot of them are directly connected with a certain website. This website sells ISK and supposedly EVE Time Codes (ETC), though the ETCs always turn out to be faulty or already used. Players that go to this website and do business with them are running a very high risk of getting keyloggers placed on their system and subsequently having their EVE accounts hacked, and ISK and assets removed. Customer Support cannot correct damages that result from problems with the security of username and passwords. We strongly urge everyone to keep their virus protection up to date and stay away from dodgy ISK seller websites."

Here's another novel idea. Admittedly it's a radical concept and some people might not be ready for it: Play the game and stop trying to buy your way to the top. That said, the ability to legitimately buy and sell ETC is supported by CCP Games, but only from the official ETC resellers, paired with a secure system of buying/selling ETC at the EVE website. The incidents that GM Grimmi describes, as have numerous other dev blogs in the past, stem from players shelling out cash for their isk, presumably from those spam bot sites that turn up in popular channels from time to time. Standard practice with the GMs is to give the isk buyer a negative wallet balance and force him or her to claw their way back up to a positive balance; CCP bans sellers but not buyers. But perhaps this is too lenient. Do you think these players should get banned for buying isk? How does your MMO of choice handle players who try to buy their currency and gear?