Well, I guess if you take this guidelines literally you might conclude I'm abusing the platform. I do feel, however, that this lottery is not contrary to the spirit of Steemit. I'm not spamming anyone, I'm investing my own money and I'm (usually) interacting with the participants. I honestly feel I'm adding valuable content to the platform because I enjoy reading most of the answers so I assume others will also. Though I know it's not a valid argument, there are much more blatant abuses going on right under our noses (bid bots, resteem bots, comment spamming) and as far as I can see nothing is being done against it.