Yes that seems like a valuable bargain sometimes, especially if you purchase an online business and then would like to keep in touch with potential customers and hundreds of people who have previously bookmarked the Twitter accounts sold. These days launching a Twitter page is too easy but promoting that is like a complicated project.
Some even big companies might complain about poor traffic their Twitter accounts receive online despite spending a lot of time adding updates to them because followers would sign up just one by one and so, it would be a time-consuming job to enhance Twitter pages. No wonder some accounts are worth fortunes these days.