24,000 twitter followers for $30, one time payment? Makes me wonder what the ratio of live humans to automatically generated bot-accounts on twitter is. And the total number of registered twitter usernames in existence.
I've experimented with this actually.
Loads of followers for $5
Loads of retweets for $5
All the followers followed me within 48 hours, within a week or two, all were banned.
All the retweets did nothing for my "organic" retweets, it provided no new coverage, since the account who retweeted it, only had fake followers, so nothing really happened.
I did use ads.twitter.com and that didn't really do much, but I'd say it did better for bang-for-buck.