Ya know the funny thing is, I instinctively came here to upvote your reply. I suspect I would have done that even if you're reply was of poor quality. Perhaps that could be construed as a form of retributive upvoting, in gratitude for the courtesy of replying. In that case, I would intuit that it is not of good practice, since it would equally skew the karma system (unless everyone is doing it, I suppose). Though, karma isn't ahhh...can't remember the economic term...replaceable by another unit of karma. There is a marginal value to karma and very different signals for negative/positive karma.