So, I ended up doing exactly what I should've done long ago myself. Wrote a python script to connect to the twitter api and do the exact same thing. Sure, it's not as interactive as tweetadder [no excel style tables of who was followed, etc.] but it works fine for me. Most importantly, it'll continue running on my Linode even while my own computer is off, so it runs 24x7x365. Works pretty well :] The other advantage is that I don't really pump through an unrealistic number of followers per day so I fly much lower than twitter's API limits. This doesn't attract any attention and works better in the long run.
Also, at least for the niches I use it in this is an extremely effective method of getting very high quality followers.
EDIT: For those who are unfamiliar with this kind of software - this is a pretty simple method to gain a lot of followers. Run twitter searches on things relevant to your niche, follow people who tweet about those things, some of those people will follow you back, unfollow the ones who do not follow you back - gain net followers. (some niches turn out very high quality followers with this method..) There was software that automated this for you (say, you could run auto searches and follow 200 people a day) but twitter barred these companies from allowing automatic functionality sometime earlier this year..
Twitter recently stopped apps from offering any kind of bulk management services for Twitter accounts. We completely support Twitter trying to stop spam, but this action does nothing of the kind. Here's my full thoughts; http://blog.manageflitter.com/twitter-drowning-spam-why-thei...
Anyway the point of this service us just to point out how ridiculous the restrictions are. We will really be delivering it, however - the economics work. We're just finalising how we'll prove it's real people, most likely with a live stream going at all times.
slight nitpick: the word is "Bayesian", not "baysian"
Eventually you'd unfollow a ton of people so that your follow/follower ratio looks healthier. For example, an account following 10000 people with 10000 followers doesn't look very authoritative. An account following 40 people with 10000 followers looks quite serious/valuable.
The reason this works is that people are notified of people who follow them but not of unfollows (they may have changed this but the fact is fewer people are notified of unfollows if at all).