As long as you are not violating the T&C , you doing great work. There is no way they can ban you or take any other action
Shoutbox is another option of driving a targeted and legitimate traffic. There is no need to worry at all.
Shoutbox is use for chatting..U can leave your link at that box. So people who click your username will redirect to your site
You only need to worry when you get a huge increase in the number of clicks (i.e. thousands) or pageviews in a very short time frame, since it raises a red flag and Big G might suspend your account. Don't sweat about $1/day
Once your traffic grows, your Adsense earnings will grow, it's normal, how do you think other people are earning from Adsense?
Don't worry, be happy. No seriously though, never heard of shoutbox, looks like a nice little app and a great way to build a few links.
That's great news! It sounds like they are legit. That's a great idea having a shoutbox. I might steal that from you... muahahah