Allows you to easily place dreamhost affiliate banners on your site via shortcode and widget.
No, DreamHost allows you to act as an affiliate without paying a monthly subscription.
Yep, free with no strings attached. I use my own affiliate link for examples. Any sales that come in through my link I consider to be 'donations' of sorts.
Definitely, as long as there are people who are using it and loving it. We're working on some pretty awesome features to be released in the near future.