I can see that I've spent more time crafting some comments than you have on a single post! Self-voting is homogenously applied on this platform. It matters not if it is a post or comment, they are both considered by Steemit to be "authored." Good comments can be absolutely contributory. It's not lame and it serves a purpose. I DO upvote others and you would know that if you read my entire post. Stealing from the rewards pool by design is an entirly different topic.