I know how you could do it. You need to come up with a detailed written strategy for maximizing karma with minimal actual contribution. Have some third party (or several) that LW would trust hold on to it in secrect.

Then, for a week or two, apply that strategy as directly and blatantly as you think you can get away with, racking up as many points as possible.

Once that's done, compile a list of those comments and post it into an article, along with your original strategy document and the verification from the third party that you wrote the strategy before you wrote the comments, rather than ad-hocing a "strategy" onto a run of comments that happened to succeed.

Voila: you have now pulled a karma hack and then afterwards gone white-hat with the exploit data. LW will have no choice but to give you more karma for kindly revealing the vulnerability in their system! Excellent. >:-)