This business model isn't analogous to "promoted tweets" or "Twitter ads". It's analogous to "email spam". You're a spammer essentially. Using an automated bot to fake a human interaction (favorite) in order to get my attention and get me to follow you. It doesn't matter that it's more effective than "Twitter Ads". Twitter Ads are marked as Ads, your favorites are not. I really do hope Twitter shuts you down, as well…
Meh. Doesn't seem any more offensive than a targeted ad on Amazon. It's just a favorite, after all. A subtle, "Hey, check us out." These are company/marketing/publicity accounts anyway (I'm assuming). It's not like followgen is masquerading around with a stolen identity like most follow bots, spitting out bit.ly spam with suggestive tweets and racy pictures. It's simply programmatically allowing twitter accounts to r…
It's also leveraging the fact that twitter (for now) emails the original user to tell them their tweet was favorited. So it's essentially spamming by proxy.
(Also, we've seen this before. It's just follower spam.)